Main page now uses Frame to change views when selecting items

Backgrounds unified
Menu items can be disabled thanks to custom ListView control

ModernKeePass/Pages/SaveDatabasePage.xaml.cs

@@ -0,0 +1,39 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Navigation;
+using ModernKeePass.ViewModels;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+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 SaveDatabasePage : Page
+    {
+        public SaveDatabasePage()
+        {
+            this.InitializeComponent();
+            DataContext = new DatabaseVm();
+        }
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            base.OnNavigatedTo(e);
+            var app = (App)Application.Current;
+            if (app.Database == null) return;
+            var databaseVm = DataContext as DatabaseVm;
+            if (databaseVm == null) return;
+            databaseVm.IsOpen = app.Database.IsOpen;
+            databaseVm.NotifyPropertyChanged("IsOpen");
+        }
+
+        private void SaveButton_OnClick(object sender, RoutedEventArgs e)
+        {
+            var app = (App) Application.Current;
+            app.Database.Save();
+            app.Database.Close();
+        }
+    }
+}