Adds some VM tests

New tooltip in Textbox with button control
New welcome page in Settings (shown when noting is selected)
Settings are now grouped

ModernKeePass/Controls/CompositeKeyUserControl.xaml.cs

@@ -71,7 +71,11 @@ namespace ModernKeePass.Controls
         {
             ValidationChecking?.Invoke(this, new EventArgs());
 
-            if (UpdateKey) Model.UpdateKey();
+            if (UpdateKey)
+            {
+                Model.UpdateKey();
+                ValidationChecked?.Invoke(this, new PasswordEventArgs(Model.RootGroup));
+            }
             else
             {
                 var oldLabel = ButtonLabel;

ModernKeePass/Controls/TextBoxWithButton.cs

@@ -6,18 +6,6 @@ namespace ModernKeePass.Controls
 {
     public class TextBoxWithButton : TextBox
     {
-        /*public Symbol ButtonSymbol
-        {
-            get { return (Symbol)GetValue(ButtonSymbolProperty); }
-            set { SetValue(ButtonSymbolProperty, value); }
-        }
-        public static readonly DependencyProperty ButtonSymbolProperty =
-            DependencyProperty.Register(
-                "ButtonSymbol",
-                typeof(Symbol),
-                typeof(TextBoxWithButton),
-                new PropertyMetadata(Symbol.Delete, (o, args) => { }));*/
-
         public string ButtonSymbol
         {
             get { return (string)GetValue(ButtonSymbolProperty); }
@@ -31,6 +19,18 @@ namespace ModernKeePass.Controls
                 new PropertyMetadata("", (o, args) => { }));
         public event EventHandler<RoutedEventArgs> ButtonClick;
 
+        public string ButtonTooltip
+        {
+            get { return (string)GetValue(ButtonTooltipProperty); }
+            set { SetValue(ButtonTooltipProperty, value); }
+        }
+        public static readonly DependencyProperty ButtonTooltipProperty =
+            DependencyProperty.Register(
+                "ButtonTooltip",
+                typeof(string),
+                typeof(TextBoxWithButton),
+                new PropertyMetadata(string.Empty, (o, args) => { }));
+
         protected override void OnApplyTemplate()
         {
             base.OnApplyTemplate();