Major changes in MainPage: now is layout dependant (with a base, to prepare for Settings)

Main sub pages also changed to better work with Main (but needs improvement)
Added a Settings Page stub

ModernKeePass/App.xaml.cs

@@ -17,7 +17,7 @@ namespace ModernKeePass
     /// <summary>
     /// Provides application-specific behavior to supplement the default Application class.
     /// </summary>
-    sealed partial class App : Application
+    sealed partial class App
     {
         public DatabaseHelper Database { get; set; } = new DatabaseHelper();
         public Dictionary<string, IPwEntity> PendingDeleteEntities = new Dictionary<string, IPwEntity>();
@@ -87,7 +87,7 @@ namespace ModernKeePass
                     // When the navigation stack isn't restored navigate to the first page,
                     // configuring the new page by passing required information as a navigation
                     // parameter
-                    rootFrame.Navigate(typeof(MainPage), lauchActivatedEventArgs.Arguments);
+                    rootFrame.Navigate(typeof(Pages.MainPage), lauchActivatedEventArgs.Arguments);
                 }
                 else
                 {
@@ -140,7 +140,7 @@ namespace ModernKeePass
             base.OnFileActivated(args);
             var rootFrame = new Frame();
             Database.DatabaseFile = args.Files[0] as StorageFile;
-            rootFrame.Navigate(typeof(MainPage), args);
+            rootFrame.Navigate(typeof(Pages.MainPage), args);
             Window.Current.Content = rootFrame;
             Window.Current.Activate();
         }

ModernKeePass/Interfaces/IHasSelectableObject.cs

@@ -0,0 +1,7 @@
+namespace ModernKeePass.Interfaces
+{
+    public interface IHasSelectableObject
+    {
+        ISelectableModel SelectedItem { get; set; }
+    }
+}

ModernKeePass/Interfaces/ISelectableModel.cs

@@ -0,0 +1,7 @@
+namespace ModernKeePass.Interfaces
+{
+    public interface ISelectableModel
+    {
+        bool IsSelected { get; set; }
+    }
+}

ModernKeePass/ModernKeePass.csproj

@@ -119,7 +119,10 @@
     <Compile Include="Common\RelayCommand.cs" />
     <Compile Include="Common\SuspensionManager.cs" />
     <Compile Include="Common\ToastNotificationHelper.cs" />
-    <Compile Include="Controls\FirstItemDataTemplateSelector.cs" />
+    <Compile Include="Interfaces\IHasSelectableObject.cs" />
+    <Compile Include="Interfaces\ISelectableModel.cs" />
+    <Compile Include="Pages\BasePages\LayoutAwarePageBase.cs" />
+    <Compile Include="TemplateSelectors\FirstItemDataTemplateSelector.cs" />
     <Compile Include="Controls\ListViewWithDisable.cs" />
     <Compile Include="Controls\OpenDatabaseUserControl.xaml.cs">
       <DependentUpon>OpenDatabaseUserControl.xaml</DependentUpon>
@@ -140,13 +143,16 @@
       <DependentUpon>MainPage.xaml</DependentUpon>
     </Compile>
     <Compile Include="Mappings\PwIconToSegoeMapping.cs" />
-    <Compile Include="Pages\AboutPage.xaml.cs">
+    <Compile Include="Pages\MainPageFrames\AboutPage.xaml.cs">
       <DependentUpon>AboutPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="Pages\NewDatabasePage.xaml.cs">
+    <Compile Include="Pages\MainPageFrames\NewDatabasePage.xaml.cs">
       <DependentUpon>NewDatabasePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="Pages\WelcomePage.xaml.cs">
+    <Compile Include="Pages\SettingsPage.xaml.cs">
+      <DependentUpon>SettingsPage.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="Pages\MainPageFrames\WelcomePage.xaml.cs">
       <DependentUpon>WelcomePage.xaml</DependentUpon>
     </Compile>
     <Compile Include="ViewModels\AboutVm.cs" />
@@ -158,13 +164,13 @@
     <Compile Include="Pages\GroupDetailPage.xaml.cs">
       <DependentUpon>GroupDetailPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="Pages\OpenDatabasePage.xaml.cs">
+    <Compile Include="Pages\MainPageFrames\OpenDatabasePage.xaml.cs">
       <DependentUpon>OpenDatabasePage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="Pages\RecentDatabasesPage.xaml.cs">
+    <Compile Include="Pages\MainPageFrames\RecentDatabasesPage.xaml.cs">
       <DependentUpon>RecentDatabasesPage.xaml</DependentUpon>
     </Compile>
-    <Compile Include="Pages\SaveDatabasePage.xaml.cs">
+    <Compile Include="Pages\MainPageFrames\SaveDatabasePage.xaml.cs">
       <DependentUpon>SaveDatabasePage.xaml</DependentUpon>
     </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -202,7 +208,7 @@
       <Generator>MSBuild:Compile</Generator>
       <SubType>Designer</SubType>
     </Page>
-    <Page Include="Pages\AboutPage.xaml">
+    <Page Include="Pages\MainPageFrames\AboutPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
@@ -214,23 +220,27 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="Pages\NewDatabasePage.xaml">
+    <Page Include="Pages\MainPageFrames\NewDatabasePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="Pages\OpenDatabasePage.xaml">
+    <Page Include="Pages\MainPageFrames\OpenDatabasePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="Pages\RecentDatabasesPage.xaml">
+    <Page Include="Pages\MainPageFrames\RecentDatabasesPage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="Pages\SaveDatabasePage.xaml">
+    <Page Include="Pages\MainPageFrames\SaveDatabasePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
-    <Page Include="Pages\WelcomePage.xaml">
+    <Page Include="Pages\SettingsPage.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Include="Pages\MainPageFrames\WelcomePage.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
@@ -320,6 +330,9 @@
       <Name>ModernKeePassLib</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Pages\SettingsPageFrames\" />
+  </ItemGroup>
   <PropertyGroup Condition=" '$(VisualStudioVersion)' == '' or '$(VisualStudioVersion)' &lt; '12.0' ">
     <VisualStudioVersion>12.0</VisualStudioVersion>
   </PropertyGroup>

ModernKeePass/Pages/BasePages/LayoutAwarePageBase.cs

@@ -0,0 +1,184 @@
+using System;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Data;
+using ModernKeePass.Common;
+using ModernKeePass.Interfaces;
+
+namespace ModernKeePass.Pages.BasePages
+{
+    public class LayoutAwarePageBase: Page
+    {
+        /// <summary>
+        /// NavigationHelper is used on each page to aid in navigation and 
+        /// process lifetime management
+        /// </summary>
+        public NavigationHelper NavigationHelper { get; }
+
+        public virtual ListView ListView { get; set; }
+        public virtual CollectionViewSource ListViewSource { get; set; }
+        public virtual IHasSelectableObject Model { get; set; }
+
+        public LayoutAwarePageBase()
+        {
+            // Setup the navigation helper
+            NavigationHelper = new NavigationHelper(this);
+            NavigationHelper.LoadState += navigationHelper_LoadState;
+            NavigationHelper.SaveState += navigationHelper_SaveState;
+
+            // Setup the logical page navigation components that allow
+            // the page to only show one pane at a time.
+            NavigationHelper.GoBackCommand = new RelayCommand(() => GoBack(), () => CanGoBack());
+
+            // Start listening for Window size changes 
+            // to change from showing two panes to showing a single pane
+            Window.Current.SizeChanged += Window_SizeChanged;
+            InvalidateVisualState();
+        }
+
+        protected void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            // Invalidate the view state when logical page navigation is in effect, as a change
+            // in selection may cause a corresponding change in the current logical page.  When
+            // an item is selected this has the effect of changing from displaying the item list
+            // to showing the selected item's details.  When the selection is cleared this has the
+            // opposite effect.
+            if (!UsingLogicalPageNavigation()) return;
+            NavigationHelper.GoBackCommand.RaiseCanExecuteChanged();
+            InvalidateVisualState();
+        }
+
+        /// <summary>
+        /// Populates the page with content passed during navigation.  Any saved state is also
+        /// provided when recreating a page from a prior session.
+        /// </summary>
+        /// <param name="sender">
+        /// The source of the event; typically <see cref="Common.NavigationHelper"/>
+        /// </param>
+        /// <param name="e">Event data that provides both the navigation parameter passed to
+        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
+        /// a dictionary of state preserved by this page during an earlier
+        /// session.  The state will be null the first time a page is visited.</param>
+        protected void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
+        {
+            // TODO: Assign a bindable group to Me.DefaultViewModel("Group")
+            // TODO: Assign a collection of bindable items to Me.DefaultViewModel("Items")
+
+            if (e.PageState == null)
+            {
+                // When this is a new page, select the first item automatically unless logical page
+                // navigation is being used (see the logical page navigation #region below.)
+                if (!UsingLogicalPageNavigation() && ListViewSource.View != null)
+                {
+                    ListViewSource.View.MoveCurrentToFirst();
+                }
+            }
+            else
+            {
+                // Restore the previously saved state associated with this page
+                if (e.PageState.ContainsKey("SelectedItem") && ListViewSource.View != null)
+                {
+                    ListViewSource.View.MoveCurrentTo(e.PageState["SelectedItem"]);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Preserves state associated with this page in case the application is suspended or the
+        /// page is discarded from the navigation cache.  Values must conform to the serialization
+        /// requirements of <see cref="Common.SuspensionManager.SessionState"/>.
+        /// </summary>
+        /// <param name="sender">The source of the event; typically <see cref="Common.NavigationHelper"/></param>
+        /// <param name="e">Event data that provides an empty dictionary to be populated with
+        /// serializable state.</param>
+        protected void navigationHelper_SaveState(object sender, SaveStateEventArgs e)
+        {
+            if (ListViewSource.View != null)
+            {
+                e.PageState["SelectedItem"] = Model?.SelectedItem;
+            }
+        }
+
+        #region Logical page navigation
+
+        // The split page is designed so that when the Window does have enough space to show
+        // both the list and the details, only one pane will be shown at at time.
+        //
+        // This is all implemented with a single physical page that can represent two logical
+        // pages.  The code below achieves this goal without making the user aware of the
+        // distinction.
+
+        protected const int MinimumWidthForSupportingTwoPanes = 768;
+
+        /// <summary>
+        /// Invoked to determine whether the page should act as one logical page or two.
+        /// </summary>
+        /// <returns>True if the window should show act as one logical page, false
+        /// otherwise.</returns>
+        protected bool UsingLogicalPageNavigation()
+        {
+            return Window.Current.Bounds.Width < MinimumWidthForSupportingTwoPanes;
+        }
+
+        /// <summary>
+        /// Invoked with the Window changes size
+        /// </summary>
+        /// <param name="sender">The current Window</param>
+        /// <param name="e">Event data that describes the new size of the Window</param>
+        protected void Window_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
+        {
+            InvalidateVisualState();
+        }
+
+        protected bool CanGoBack()
+        {
+            if (UsingLogicalPageNavigation() && ListView.SelectedItem != null)
+            {
+                return true;
+            }
+            return NavigationHelper.CanGoBack();
+        }
+        protected void GoBack()
+        {
+            if (UsingLogicalPageNavigation() && ListView.SelectedItem != null)
+            {
+                // When logical page navigation is in effect and there's a selected item that
+                // item's details are currently displayed.  Clearing the selection will return to
+                // the item list.  From the user's point of view this is a logical backward
+                // navigation.
+                ListView.SelectedItem = null;
+            }
+            else
+            {
+                NavigationHelper.GoBack();
+            }
+        }
+
+        protected void InvalidateVisualState()
+        {
+            var visualState = DetermineVisualState();
+            VisualStateManager.GoToState(this, visualState, false);
+            NavigationHelper.GoBackCommand.RaiseCanExecuteChanged();
+        }
+
+        /// <summary>
+        /// Invoked to determine the name of the visual state that corresponds to an application
+        /// view state.
+        /// </summary>
+        /// <returns>The name of the desired visual state.  This is the same as the name of the
+        /// view state except when there is a selected item in portrait and snapped views where
+        /// this additional logical page is represented by adding a suffix of _Detail.</returns>
+        protected string DetermineVisualState()
+        {
+            if (!UsingLogicalPageNavigation())
+                return "PrimaryView";
+
+            // Update the back button's enabled state when the view state changes
+            var logicalPageBack = UsingLogicalPageNavigation() && ListView?.SelectedItem != null;
+
+            return logicalPageBack ? "SinglePane_Detail" : "SinglePane";
+        }
+
+        #endregion
+    }
+}

ModernKeePass/Pages/EntryDetailPage.xaml

@@ -379,7 +379,9 @@
                         </core:EventTriggerBehavior>
                     </interactivity:Interaction.Behaviors>
                 </AppBarButton>
-                <AppBarButton Icon="Setting" Label="Settings" />
+                <AppBarButton Icon="Setting" Label="Settings">
+                    <core:NavigateToPageAction TargetPage="ModernKeePass.Pages.SettingsPage" />
+                </AppBarButton>
             </CommandBar.SecondaryCommands>
             <AppBarToggleButton Icon="Edit" Label="Edit" IsChecked="{Binding IsEditMode, Mode=TwoWay}">
                 <interactivity:Interaction.Behaviors>

ModernKeePass/Pages/GroupDetailPage.xaml

@@ -5,10 +5,10 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:viewModels="using:ModernKeePass.ViewModels"
     xmlns:converters="using:ModernKeePass.Converters"
-    xmlns:local="using:ModernKeePass.Controls"
     xmlns:interactivity="using:Microsoft.Xaml.Interactivity" 
     xmlns:core="using:Microsoft.Xaml.Interactions.Core"
     xmlns:actions="using:ModernKeePass.Actions" 
+    xmlns:templateSelectors="using:ModernKeePass.TemplateSelectors"
     x:Name="PageRoot"
     x:Class="ModernKeePass.Pages.GroupDetailPage"
     mc:Ignorable="d" >
@@ -32,7 +32,9 @@
                         </core:EventTriggerBehavior>
                     </interactivity:Interaction.Behaviors>
                 </AppBarButton>
-                <AppBarButton Icon="Setting" Label="Settings" />
+                <AppBarButton Icon="Setting" Label="Settings">
+                    <core:NavigateToPageAction TargetPage="ModernKeePass.Pages.SettingsPage" />
+                </AppBarButton>
             </CommandBar.SecondaryCommands>
             <AppBarToggleButton Icon="Edit" Label="Edit" IsChecked="{Binding IsEditMode, Mode=TwoWay}">
                 <interactivity:Interaction.Behaviors>
@@ -139,7 +141,7 @@
                         <viewModels:EntryVm/>
                     </GridView.DataContext>
                     <GridView.ItemTemplateSelector>
-                        <local:FirstItemDataTemplateSelector 
+                        <templateSelectors:FirstItemDataTemplateSelector 
                             FirstItem="{StaticResource GroupFirstItem}" 
                             OtherItem="{StaticResource GroupOtherItem}" />
                     </GridView.ItemTemplateSelector>

ModernKeePass/Pages/MainPage.xaml

@@ -1,16 +1,14 @@
-<Page
+<basePages:LayoutAwarePageBase
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:viewModels="using:ModernKeePass.ViewModels" 
     xmlns:controls="using:ModernKeePass.Controls" 
-    x:Class="ModernKeePass.MainPage"
-    mc:Ignorable="d"
-    Background="{StaticResource ApplicationPageBackgroundThemeBrush}" >
-    <Page.DataContext>
-        <viewModels:MainVm />
-    </Page.DataContext>
+    xmlns:basePages="using:ModernKeePass.Pages.BasePages"
+    x:Class="ModernKeePass.Pages.MainPage"
+    x:Name="PageRoot"
+    mc:Ignorable="d">
     <Page.Resources>
         <CollectionViewSource 
             x:Name="MenuItemsSource" 
@@ -18,49 +16,136 @@
             IsSourceGrouped="True" />
     </Page.Resources>
 
-    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}" >
+    <Page.Background>
+        <StaticResource ResourceKey="ApplicationPageBackgroundThemeBrush"/>
+    </Page.Background>
+    <Page.DataContext>
+        <viewModels:MainVm />
+    </Page.DataContext>
+
+    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.ChildrenTransitions>
+            <TransitionCollection>
+                <EntranceThemeTransition/>
+            </TransitionCollection>
+        </Grid.ChildrenTransitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="70"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="Auto" />
-            <ColumnDefinition Width="50" />
-            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition x:Name="PrimaryColumn" Width="350" />
+            <ColumnDefinition x:Name="SecondaryColumn" Width="*" />
         </Grid.ColumnDefinitions>
-        <controls:ListViewWithDisable Grid.Column="0" 
+
+        <!-- Back button and page title -->
+        <Grid x:Name="TitlePanel" Background="{ThemeResource AppBarBackgroundThemeBrush}">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto"/>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
+            <Button x:Name="BackButton" Margin="39,20,0,0" Command="{Binding NavigationHelper.GoBackCommand, ElementName=PageRoot}"
+                    Style="{StaticResource NavigationBackButtonNormalStyle}"
+                    Visibility="Collapsed"
+                    VerticalAlignment="Top"
+                    AutomationProperties.Name="Back"
+                    AutomationProperties.AutomationId="BackButton"
+                    AutomationProperties.ItemType="Navigation Button"/>
+            <TextBlock x:Name="TitleTextBox" Text="{Binding Name}" Grid.Column="1" FontSize="24" Margin="20" />
+        </Grid>
+        <controls:ListViewWithDisable 
+            Grid.Column="0"
+            Grid.Row="1"
             x:Name="MenuListView"
-            RequestedTheme="Dark"
-            SelectionChanged="ListView_SelectionChanged" 
-            Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
+            SelectionChanged="MenuListView_SelectionChanged" 
+            Background="{ThemeResource AppBarBackgroundThemeBrush}"
             ItemsSource="{Binding Source={StaticResource MenuItemsSource}}"
             SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
             IsSynchronizedWithCurrentItem="False">
-            <ListView.Header>
-                <TextBlock Text="{Binding Name}" FontWeight="Bold" FontSize="36" Margin="20" />
-            </ListView.Header>
-            <ListView.ItemTemplate>
+            <controls:ListViewWithDisable.ItemTemplate>
                 <DataTemplate >
                     <StackPanel Orientation="Horizontal">
                         <SymbolIcon Symbol="{Binding SymbolIcon}" />
                         <TextBlock Text="{Binding Title}" Margin="10,5,0,0" />
                     </StackPanel>
                 </DataTemplate>
-            </ListView.ItemTemplate>
-            <ListView.ItemContainerStyle>
+            </controls:ListViewWithDisable.ItemTemplate>
+            <controls:ListViewWithDisable.ItemContainerStyle>
                 <Style TargetType="ListViewItem">
                     <Setter Property="Padding" Value="20,5,0,0" />
                     <Setter Property="Margin" Value="0" />
                 </Style>
-            </ListView.ItemContainerStyle>
-            <ListView.GroupStyle>
+            </controls:ListViewWithDisable.ItemContainerStyle>
+            <controls:ListViewWithDisable.GroupStyle>
                 <GroupStyle HidesIfEmpty="True">
                     <GroupStyle.HeaderTemplate>
                         <DataTemplate>
                             <Grid Background="DarkGray" Margin="20,0,0,0">
-                                <Border Height="1" Width="240" HorizontalAlignment="Stretch"/>
+                                <Border Height="1" Width="300" HorizontalAlignment="Stretch"/>
                             </Grid>
                         </DataTemplate>
                     </GroupStyle.HeaderTemplate>
                 </GroupStyle>
-            </ListView.GroupStyle>
+            </controls:ListViewWithDisable.GroupStyle>
         </controls:ListViewWithDisable>
-        <Frame Grid.Column="2" Name="MenuFrame" Width="auto" Margin="0,60,0,0" />
+        <Frame x:Name="MenuFrame" Grid.Column="1" Grid.Row="0" Grid.RowSpan="2" Width="auto" Margin="30,60,0,0" />
+
+        <VisualStateManager.VisualStateGroups>
+            <!-- Visual states reflect the application's view state -->
+            <VisualStateGroup x:Name="ViewStates">
+                <VisualState x:Name="PrimaryView" />
+                <VisualState x:Name="SinglePane">
+                    <Storyboard>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PrimaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SecondaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuFrame" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuListView" Storyboard.TargetProperty="Padding">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="120,0,90,60"/>
+                        </ObjectAnimationUsingKeyFrames>
+                    </Storyboard>
+                </VisualState>
+                <!--
+                    When an item is selected and only one pane is shown the details display requires more extensive changes:
+                     * Hide the master list and the column it was in
+                     * Move item details down a row to make room for the title
+                     * Move the title directly above the details
+                     * Adjust padding for details
+                 -->
+                <VisualState x:Name="SinglePane_Detail">
+                    <Storyboard>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PrimaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuListView" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuFrame" Storyboard.TargetProperty="(Grid.Row)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuFrame" Storyboard.TargetProperty="(Grid.RowSpan)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="TitlePanel" Storyboard.TargetProperty="(Grid.Column)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackButton" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="TitleTextBox" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MenuFrame" Storyboard.TargetProperty="Margin">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="10,0,0,0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                    </Storyboard>
+                </VisualState>
+            </VisualStateGroup>
+        </VisualStateManager.VisualStateGroups>
     </Grid>
-</Page>
+</basePages:LayoutAwarePageBase>

ModernKeePass/Pages/MainPage.xaml.cs

@@ -1,34 +1,56 @@
-using Windows.UI.Xaml.Controls;
+using System;
+using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Navigation;
-using ModernKeePass.Pages;
 using ModernKeePass.ViewModels;
 
 // The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
 
-namespace ModernKeePass
+namespace ModernKeePass.Pages
 {
     /// <summary>
     /// An empty page that can be used on its own or navigated to within a Frame.
     /// </summary>
     public sealed partial class MainPage
     {
-        public MainVm Model => (MainVm)DataContext;
+        public new MainVm Model => (MainVm)DataContext;
         
         public MainPage()
         {
             InitializeComponent();
+            ListView = MenuListView;
+            ListViewSource = MenuItemsSource;
         }
 
+        private void MenuListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            ListView_SelectionChanged(sender, e);
+            var selectedItem = Model.SelectedItem as MainMenuItemVm;
+            selectedItem?.Destination.Navigate(selectedItem.PageType, selectedItem.Parameter);
+        }
+        
+        #region NavigationHelper registration
+
+        /// The methods provided in this section are simply used to allow
+        /// NavigationHelper to respond to the page's navigation methods.
+        /// 
+        /// Page specific logic should be placed in event handlers for the  
+        /// <see cref="Common.NavigationHelper.LoadState"/>
+        /// and <see cref="Common.NavigationHelper.SaveState"/>.
+        /// The navigation parameter is available in the LoadState method 
+        /// in addition to page state preserved during an earlier session.
+        
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
-            base.OnNavigatedTo(e);
+            NavigationHelper.OnNavigatedTo(e);
             DataContext = new MainVm(Frame, MenuFrame);
             if (Model.SelectedItem == null) MenuFrame.Navigate(typeof(WelcomePage));
         }
 
-        private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        protected override void OnNavigatedFrom(NavigationEventArgs e)
         {
-            Model.SelectedItem?.Destination.Navigate(Model.SelectedItem.PageType, Model.SelectedItem.Parameter);
+            NavigationHelper.OnNavigatedFrom(e);
         }
+
+        #endregion
     }
 }

ModernKeePass/Pages/MainPageFrames/AboutPage.xaml

@@ -12,7 +12,7 @@
     </Page.DataContext>
 
     <StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="0,-20,0,20">
+        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="80,-60,0,20" FontSize="36">
             <Run Text="About"/>
         </TextBlock>
         <TextBlock Style="{StaticResource BodyTextBlockStyle}">

ModernKeePass/Pages/MainPageFrames/NewDatabasePage.xaml

@@ -19,7 +19,9 @@
     </Page.DataContext>
     
     <StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="0,-20,0,20">New</TextBlock>
+        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="80,-60,0,20" FontSize="36">
+            <Run Text="New"></Run>
+        </TextBlock>
         <HyperlinkButton Content="Create new..." Click="ButtonBase_OnClick" />
         <TextBlock Style="{StaticResource BodyTextBlockStyle}" Margin="15,0,0,30">Create a new password database to the location of your chosing.</TextBlock>
         <Border HorizontalAlignment="Left" BorderThickness="1" BorderBrush="AliceBlue" Width="550" Visibility="{Binding ShowPasswordBox, Converter={StaticResource BooleanToVisibilityConverter}}">

ModernKeePass/Pages/MainPageFrames/OpenDatabasePage.xaml

@@ -17,7 +17,9 @@
     </Page.DataContext>
 
     <StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="0,-20,0,20">Open</TextBlock>
+        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="80,-60,0,20" FontSize="36">
+            <Run Text="Open"></Run>
+        </TextBlock>
         <HyperlinkButton Content="Browse files..." Click="ButtonBase_OnClick" />
         <TextBlock Style="{StaticResource BodyTextBlockStyle}" Margin="15,0,0,30">Open an existing password database from your PC.</TextBlock>
         <HyperlinkButton Content="From Url..." IsEnabled="False" />

ModernKeePass/Pages/MainPageFrames/RecentDatabasesPage.xaml

@@ -17,7 +17,7 @@
         <viewModels:RecentVm/>
     </Page.DataContext>
     <StackPanel Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
-        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="0,-20,0,20">
+        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="80,-60,0,20" FontSize="36">
             <Run Text="Recent"/>
         </TextBlock>
         <ListView 

ModernKeePass/Pages/MainPageFrames/SaveDatabasePage.xaml

@@ -11,7 +11,9 @@
     </Page.DataContext>
 
     <StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-        <TextBlock Style="{StaticResource HeaderTextBlockStyle}" Margin="0,-20,0,20">Save</TextBlock>
+        <TextBlock Style="{StaticResource HeaderTextBlockStyle}"  Margin="80,-60,0,20" FontSize="36">
+            <Run Text="Save"></Run>
+        </TextBlock>
         <HyperlinkButton Content="Save and close" Click="SaveButton_OnClick" />
         <TextBlock Style="{StaticResource BodyTextBlockStyle}" Margin="15,0,0,30">This will save and close the currently opened database.</TextBlock>
         <HyperlinkButton Content="Save as..." Click="SaveAsButton_OnClick" />

ModernKeePass/Pages/SettingsPage.xaml

@@ -0,0 +1,181 @@
+<Page
+    x:Name="pageRoot"
+    x:Class="ModernKeePass.Pages.SettingsPage"
+    DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:ModernKeePass.Pages"
+    xmlns:common="using:ModernKeePass.Common"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Page.Resources>
+        <!-- Collection of items displayed by this page -->
+        <CollectionViewSource
+        x:Name="itemsViewSource"
+        Source="{Binding Items}"/>
+    </Page.Resources>
+
+    <!--
+        This grid acts as a root panel for the page that defines two rows:
+        * Row 0 contains the back button and page title
+        * Row 1 contains the rest of the page layout
+    -->
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.ChildrenTransitions>
+            <TransitionCollection>
+                <EntranceThemeTransition/>
+            </TransitionCollection>
+        </Grid.ChildrenTransitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="140"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition x:Name="primaryColumn" Width="420"/>
+            <ColumnDefinition x:Name="secondaryColumn" Width="*"/>
+        </Grid.ColumnDefinitions>
+
+        <!-- Back button and page title -->
+        <Grid x:Name="titlePanel">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="120"/>
+                <ColumnDefinition Width="*"/>
+            </Grid.ColumnDefinitions>
+            <Button x:Name="backButton" Margin="39,59,39,0" Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}"
+                        Style="{StaticResource NavigationBackButtonNormalStyle}"
+                        VerticalAlignment="Top"
+                        AutomationProperties.Name="Back"
+                        AutomationProperties.AutomationId="BackButton"
+                        AutomationProperties.ItemType="Navigation Button"/>
+            <TextBlock x:Name="pageTitle" Text="{Binding Title}" Style="{StaticResource HeaderTextBlockStyle}" Grid.Column="1" 
+                        IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Bottom" Margin="0,0,0,40"/>
+        </Grid>
+
+        <!-- Vertical scrolling item list -->
+        <ListView
+            x:Name="itemListView"
+            AutomationProperties.AutomationId="ItemsListView"
+            AutomationProperties.Name="Items"
+            TabIndex="1"
+            Grid.Row="1"
+            Margin="-10,-10,0,0"
+            Padding="120,0,0,60"
+            ItemsSource="{Binding Source={StaticResource itemsViewSource}}"
+            IsSwipeEnabled="False"
+            SelectionChanged="ItemListView_SelectionChanged">
+            <ListView.ItemTemplate>
+                <DataTemplate>
+                    <Grid Margin="6">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="Auto"/>
+                            <ColumnDefinition Width="*"/>
+                        </Grid.ColumnDefinitions>
+                        <Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}" Width="60" Height="60">
+                            <Image Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
+                        </Border>
+                        <StackPanel Grid.Column="1" Margin="10,0,0,0">
+                            <TextBlock Text="{Binding Title}" Style="{StaticResource TitleTextBlockStyle}" TextWrapping="NoWrap" MaxHeight="40"/>
+                            <TextBlock Text="{Binding Subtitle}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap"/>
+                        </StackPanel>
+                    </Grid>
+                </DataTemplate>
+            </ListView.ItemTemplate>
+            <ListView.ItemContainerStyle>
+                <Style TargetType="FrameworkElement">
+                    <Setter Property="Margin" Value="0,0,0,10"/>
+                </Style>
+            </ListView.ItemContainerStyle>
+        </ListView>
+
+
+        <!-- Details for selected item -->
+        <ScrollViewer
+            x:Name="itemDetail"
+            AutomationProperties.AutomationId="ItemDetailScrollViewer"
+            Grid.Column="1"
+            Grid.RowSpan="2"
+            Padding="60,0,66,0"
+            DataContext="{Binding SelectedItem, ElementName=itemListView}"
+            HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto"
+            ScrollViewer.HorizontalScrollMode="Disabled" ScrollViewer.VerticalScrollMode="Enabled"
+            ScrollViewer.ZoomMode="Disabled">
+
+            <Grid x:Name="itemDetailGrid" Margin="0,60,0,50">
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="Auto"/>
+                    <RowDefinition Height="*"/>
+                </Grid.RowDefinitions>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto"/>
+                    <ColumnDefinition Width="*"/>
+                </Grid.ColumnDefinitions>
+
+                <Image Grid.Row="1" Margin="0,0,20,0" Width="180" Height="180" Source="{Binding ImagePath}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/>
+                <StackPanel x:Name="itemDetailTitlePanel" Grid.Row="1" Grid.Column="1">
+                    <TextBlock x:Name="itemTitle" Margin="0,-10,0,0" Text="{Binding Title}" Style="{StaticResource SubheaderTextBlockStyle}"/>
+                    <TextBlock x:Name="itemSubtitle" Margin="0,0,0,20" Text="{Binding Subtitle}" Style="{StaticResource SubtitleTextBlockStyle}"/>
+                </StackPanel>
+                <TextBlock Grid.Row="2" Grid.ColumnSpan="2" Margin="0,20,0,0" Text="{Binding Content}" Style="{StaticResource BodyTextBlockStyle}"/>
+            </Grid>
+        </ScrollViewer>
+
+        <VisualStateManager.VisualStateGroups>
+
+            <!-- Visual states reflect the application's view state -->
+            <VisualStateGroup x:Name="ViewStates">
+                <VisualState x:Name="PrimaryView" />
+                <VisualState x:Name="SinglePane">
+                    <Storyboard>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="primaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="*"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="secondaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemDetail" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemListView" Storyboard.TargetProperty="Padding">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="120,0,90,60"/>
+                        </ObjectAnimationUsingKeyFrames>
+                    </Storyboard>
+                </VisualState>
+                <!--
+                    When an item is selected and only one pane is shown the details display requires more extensive changes:
+                     * Hide the master list and the column it was in
+                     * Move item details down a row to make room for the title
+                     * Move the title directly above the details
+                     * Adjust padding for details
+                 -->
+                <VisualState x:Name="SinglePane_Detail">
+                    <Storyboard>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="primaryColumn" Storyboard.TargetProperty="Width">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemListView" Storyboard.TargetProperty="Visibility">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemDetail" Storyboard.TargetProperty="(Grid.Row)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemDetail" Storyboard.TargetProperty="(Grid.RowSpan)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="titlePanel" Storyboard.TargetProperty="(Grid.Column)">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemDetailGrid" Storyboard.TargetProperty="Margin">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="0,0,0,60"/>
+                        </ObjectAnimationUsingKeyFrames>
+                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="itemDetail" Storyboard.TargetProperty="Padding">
+                            <DiscreteObjectKeyFrame KeyTime="0" Value="120,0,90,0"/>
+                        </ObjectAnimationUsingKeyFrames>
+                    </Storyboard>
+                </VisualState>
+            </VisualStateGroup>
+        </VisualStateManager.VisualStateGroups>
+    </Grid>
+</Page>

ModernKeePass/Pages/SettingsPage.xaml.cs

@@ -0,0 +1,255 @@
+using ModernKeePass.Common;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using System.Windows.Input;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+using Windows.UI.ViewManagement;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using Windows.UI.Xaml.Data;
+using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Media;
+using Windows.UI.Xaml.Navigation;
+
+// The Split Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234234
+
+namespace ModernKeePass.Pages
+{
+    /// <summary>
+    /// A page that displays a group title, a list of items within the group, and details for
+    /// the currently selected item.
+    /// </summary>
+    public sealed partial class SettingsPage : Page
+    {
+        private NavigationHelper navigationHelper;
+        private ObservableDictionary defaultViewModel = new ObservableDictionary();
+
+        /// <summary>
+        /// This can be changed to a strongly typed view model.
+        /// </summary>
+        public ObservableDictionary DefaultViewModel
+        {
+            get { return this.defaultViewModel; }
+        }
+
+        /// <summary>
+        /// NavigationHelper is used on each page to aid in navigation and 
+        /// process lifetime management
+        /// </summary>
+        public NavigationHelper NavigationHelper
+        {
+            get { return this.navigationHelper; }
+        }
+
+        public SettingsPage()
+        {
+            this.InitializeComponent();
+
+            // Setup the navigation helper
+            this.navigationHelper = new NavigationHelper(this);
+            this.navigationHelper.LoadState += navigationHelper_LoadState;
+            this.navigationHelper.SaveState += navigationHelper_SaveState;
+
+            // Setup the logical page navigation components that allow
+            // the page to only show one pane at a time.
+            this.navigationHelper.GoBackCommand = new ModernKeePass.Common.RelayCommand(() => this.GoBack(), () => this.CanGoBack());
+            this.itemListView.SelectionChanged += itemListView_SelectionChanged;
+
+            // Start listening for Window size changes 
+            // to change from showing two panes to showing a single pane
+            Window.Current.SizeChanged += Window_SizeChanged;
+            this.InvalidateVisualState();
+        }
+
+        void itemListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (this.UsingLogicalPageNavigation())
+            {
+                this.navigationHelper.GoBackCommand.RaiseCanExecuteChanged();
+            }
+        }
+
+        /// <summary>
+        /// Populates the page with content passed during navigation.  Any saved state is also
+        /// provided when recreating a page from a prior session.
+        /// </summary>
+        /// <param name="sender">
+        /// The source of the event; typically <see cref="Common.NavigationHelper"/>
+        /// </param>
+        /// <param name="e">Event data that provides both the navigation parameter passed to
+        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
+        /// a dictionary of state preserved by this page during an earlier
+        /// session.  The state will be null the first time a page is visited.</param>
+        private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
+        {
+            // TODO: Assign a bindable group to Me.DefaultViewModel("Group")
+            // TODO: Assign a collection of bindable items to Me.DefaultViewModel("Items")
+
+            if (e.PageState == null)
+            {
+                // When this is a new page, select the first item automatically unless logical page
+                // navigation is being used (see the logical page navigation #region below.)
+                if (!this.UsingLogicalPageNavigation() && this.itemsViewSource.View != null)
+                {
+                    this.itemsViewSource.View.MoveCurrentToFirst();
+                }
+            }
+            else
+            {
+                // Restore the previously saved state associated with this page
+                if (e.PageState.ContainsKey("SelectedItem") && this.itemsViewSource.View != null)
+                {
+                    // TODO: Invoke Me.itemsViewSource.View.MoveCurrentTo() with the selected
+                    //       item as specified by the value of pageState("SelectedItem")
+
+                }
+            }
+        }
+
+        /// <summary>
+        /// Preserves state associated with this page in case the application is suspended or the
+        /// page is discarded from the navigation cache.  Values must conform to the serialization
+        /// requirements of <see cref="Common.SuspensionManager.SessionState"/>.
+        /// </summary>
+        /// <param name="sender">The source of the event; typically <see cref="Common.NavigationHelper"/></param>
+        /// <param name="e">Event data that provides an empty dictionary to be populated with
+        /// serializable state.</param>
+        private void navigationHelper_SaveState(object sender, SaveStateEventArgs e)
+        {
+            if (this.itemsViewSource.View != null)
+            {
+                // TODO: Derive a serializable navigation parameter and assign it to
+                //       pageState("SelectedItem")
+
+            }
+        }
+
+        #region Logical page navigation
+
+        // The split page is designed so that when the Window does have enough space to show
+        // both the list and the details, only one pane will be shown at at time.
+        //
+        // This is all implemented with a single physical page that can represent two logical
+        // pages.  The code below achieves this goal without making the user aware of the
+        // distinction.
+
+        private const int MinimumWidthForSupportingTwoPanes = 768;
+
+        /// <summary>
+        /// Invoked to determine whether the page should act as one logical page or two.
+        /// </summary>
+        /// <returns>True if the window should show act as one logical page, false
+        /// otherwise.</returns>
+        private bool UsingLogicalPageNavigation()
+        {
+            return Window.Current.Bounds.Width < MinimumWidthForSupportingTwoPanes;
+        }
+
+        /// <summary>
+        /// Invoked with the Window changes size
+        /// </summary>
+        /// <param name="sender">The current Window</param>
+        /// <param name="e">Event data that describes the new size of the Window</param>
+        private void Window_SizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
+        {
+            this.InvalidateVisualState();
+        }
+
+        /// <summary>
+        /// Invoked when an item within the list is selected.
+        /// </summary>
+        /// <param name="sender">The GridView displaying the selected item.</param>
+        /// <param name="e">Event data that describes how the selection was changed.</param>
+        private void ItemListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            // Invalidate the view state when logical page navigation is in effect, as a change
+            // in selection may cause a corresponding change in the current logical page.  When
+            // an item is selected this has the effect of changing from displaying the item list
+            // to showing the selected item's details.  When the selection is cleared this has the
+            // opposite effect.
+            if (this.UsingLogicalPageNavigation()) this.InvalidateVisualState();
+        }
+
+        private bool CanGoBack()
+        {
+            if (this.UsingLogicalPageNavigation() && this.itemListView.SelectedItem != null)
+            {
+                return true;
+            }
+            else
+            {
+                return this.navigationHelper.CanGoBack();
+            }
+        }
+        private void GoBack()
+        {
+            if (this.UsingLogicalPageNavigation() && this.itemListView.SelectedItem != null)
+            {
+                // When logical page navigation is in effect and there's a selected item that
+                // item's details are currently displayed.  Clearing the selection will return to
+                // the item list.  From the user's point of view this is a logical backward
+                // navigation.
+                this.itemListView.SelectedItem = null;
+            }
+            else
+            {
+                this.navigationHelper.GoBack();
+            }
+        }
+
+        private void InvalidateVisualState()
+        {
+            var visualState = DetermineVisualState();
+            VisualStateManager.GoToState(this, visualState, false);
+            this.navigationHelper.GoBackCommand.RaiseCanExecuteChanged();
+        }
+
+        /// <summary>
+        /// Invoked to determine the name of the visual state that corresponds to an application
+        /// view state.
+        /// </summary>
+        /// <returns>The name of the desired visual state.  This is the same as the name of the
+        /// view state except when there is a selected item in portrait and snapped views where
+        /// this additional logical page is represented by adding a suffix of _Detail.</returns>
+        private string DetermineVisualState()
+        {
+            if (!UsingLogicalPageNavigation())
+                return "PrimaryView";
+
+            // Update the back button's enabled state when the view state changes
+            var logicalPageBack = this.UsingLogicalPageNavigation() && this.itemListView.SelectedItem != null;
+
+            return logicalPageBack ? "SinglePane_Detail" : "SinglePane";
+        }
+
+        #endregion
+
+        #region NavigationHelper registration
+
+        /// The methods provided in this section are simply used to allow
+        /// NavigationHelper to respond to the page's navigation methods.
+        /// 
+        /// Page specific logic should be placed in event handlers for the  
+        /// <see cref="Common.NavigationHelper.LoadState"/>
+        /// and <see cref="Common.NavigationHelper.SaveState"/>.
+        /// The navigation parameter is available in the LoadState method 
+        /// in addition to page state preserved during an earlier session.
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            navigationHelper.OnNavigatedTo(e);
+        }
+
+        protected override void OnNavigatedFrom(NavigationEventArgs e)
+        {
+            navigationHelper.OnNavigatedFrom(e);
+        }
+
+        #endregion
+    }
+}

ModernKeePass/TemplateSelectors/FirstItemDataTemplateSelector.cs

@@ -1,7 +1,7 @@
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 
-namespace ModernKeePass.Controls
+namespace ModernKeePass.TemplateSelectors
 {
     public class FirstItemDataTemplateSelector: DataTemplateSelector
     {

ModernKeePass/ViewModels/Items/MainMenuItemVm.cs

@@ -5,7 +5,7 @@ using ModernKeePass.Interfaces;
 
 namespace ModernKeePass.ViewModels
 {
-    public class MainMenuItemVm: NotifyPropertyChangedBase, IIsEnabled
+    public class MainMenuItemVm: NotifyPropertyChangedBase, IIsEnabled, ISelectableModel
     {
         private bool _isSelected;
 

ModernKeePass/ViewModels/MainVm.cs

@@ -5,11 +5,13 @@ using Windows.Storage.AccessCache;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
 using ModernKeePass.Common;
+using ModernKeePass.Interfaces;
 using ModernKeePass.Pages;
+using ModernKeePass.Pages.BasePages;
 
 namespace ModernKeePass.ViewModels
 {
-    public class MainVm : NotifyPropertyChangedBase
+    public class MainVm : NotifyPropertyChangedBase, IHasSelectableObject
     {
         private IOrderedEnumerable<IGrouping<int, MainMenuItemVm>> _mainMenuItems;
         private MainMenuItemVm _selectedItem;
@@ -22,7 +24,7 @@ namespace ModernKeePass.ViewModels
             set { SetProperty(ref _mainMenuItems, value); }
         }
 
-        public MainMenuItemVm SelectedItem
+        public ISelectableModel SelectedItem
         {
             get { return _selectedItem; }
             set
@@ -33,7 +35,7 @@ namespace ModernKeePass.ViewModels
                     _selectedItem.IsSelected = false;
                 }
 
-                SetProperty(ref _selectedItem, value);
+                SetProperty(ref _selectedItem, (MainMenuItemVm)value);
 
                 if (_selectedItem != null)
                 {