fixes

Toolkit.UI.Avalonia/ConditionalExpression.cs

@@ -1,8 +1,28 @@
 using Avalonia;
+using Avalonia.Data.Converters;
+using Avalonia.Markup.Xaml;
 using Avalonia.Metadata;
+using System.Globalization;
 
 namespace Toolkit.UI.Avalonia;
 
+public class NamedTypeConverter : 
+    MarkupExtension, 
+    IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        var d = value is not null ? value.GetType().Name : (object?)null;
+        return d;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+
+    public override object ProvideValue(IServiceProvider serviceProvider) => this;
+}
 public class ConditionalExpression :
     AvaloniaObject,
     ICondition

Toolkit.UI.Avalonia/InvokeNavigationViewItemAction.cs

@@ -14,6 +14,15 @@ public class InvokeNavigationViewItemAction :
     public static readonly StyledProperty<int> SelectedIndexProperty =
         AvaloniaProperty.Register<InvokeNavigationViewItemAction, int>(nameof(SelectedIndex), 0);
 
+    public static readonly StyledProperty<object> TargetProperty =
+        AvaloniaProperty.Register<InvokeNavigationViewItemAction, object>(nameof(Target));
+
+    public object Target
+    {
+        get => GetValue(TargetProperty);
+        set => SetValue(TargetProperty, value);
+    }
+
     public int SelectedIndex
     {
         get => GetValue(SelectedIndexProperty);
@@ -22,7 +31,7 @@ public class InvokeNavigationViewItemAction :
 
     public object? Execute(object? sender, object? parameter)
     {
-        if (sender is NavigationViewItem navigationViewItem)
+        if ((Target ?? sender) is NavigationViewItem navigationViewItem)
         {
             Dispatcher.UIThread.Post(() =>
             {
@@ -36,7 +45,7 @@ public class InvokeNavigationViewItemAction :
             }, DispatcherPriority.ContextIdle);
         }
 
-        if (sender is NavigationView navigationView)
+        if ((Target ?? sender) is NavigationView navigationView)
         {
             Dispatcher.UIThread.Invoke(() =>
             {
@@ -44,13 +53,12 @@ public class InvokeNavigationViewItemAction :
                 {
                     if (collection is { Count: > 0 })
                     {
-                        if (collection[SelectedIndex] is ISelectable selectable)
-                        {
-                            selectable.IsSelected = true;
-                        }
-
                         navigationView.SetValue(NavigationView.SelectedItemProperty, collection[SelectedIndex]);
                     }
+                    else
+                    {
+                        navigationView.SetValue(NavigationView.SelectedItemProperty, null);
+                    }
                 }
             }, DispatcherPriority.ContextIdle);
         }

Toolkit.UI.Avalonia/NavigationViewExtension.cs

@@ -34,7 +34,7 @@ public class NavigationViewExtension
                         sender.RaiseEvent(new ItemInvokedEventArgs { RoutedEvent = ItemInvokedEvent });
                     }
                 }
-       
+
                 navigationView.ItemInvoked += OnItemInvoked;
                 return true;
             }