Add failing UI test

MaterialDesignThemes.UITests/Samples/DialogHost/RestoreFocus.xaml

@@ -0,0 +1,48 @@
+<UserControl x:Class="MaterialDesignThemes.UITests.Samples.DialogHost.RestoreFocus"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:local="clr-namespace:MaterialDesignThemes.UITests.Samples.DialogHost"
+             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+             mc:Ignorable="d"
+             d:DataContext="{d:DesignInstance Type=local:RestoreFocus}"
+             d:DesignHeight="450" d:DesignWidth="800">
+  <Grid>
+    <materialDesign:DialogHost x:Name="DialogHost">
+      <Grid>
+        <Grid.RowDefinitions>
+          <RowDefinition Height="Auto" />
+          <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+
+        <Menu x:Name="Menu" Grid.Row="0" HorizontalAlignment="Right">
+          <MenuItem x:Name="MenuItem1">
+            <MenuItem.Header>
+              <StackPanel Orientation="Horizontal">
+                <materialDesign:PackIcon Kind="User" Height="20" Width="20" Margin="0,0,5,0" />
+                <TextBlock Text="Menu" VerticalAlignment="Center" FontSize="16" />
+              </StackPanel>
+            </MenuItem.Header>
+            <MenuItem x:Name="MenuItem2" Header="Settings" Icon="{materialDesign:PackIcon Kind=Settings}" Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}" />
+          </MenuItem>
+        </Menu>
+
+        <TabControl x:Name="TabControl" Grid.Row="1">
+          <TabItem x:Name="TabItem1" Header="Tab 1">
+            <TextBlock Text="Page 1" />
+          </TabItem>
+          <TabItem x:Name="TabItem2" Header="Tab 2">
+            <TextBlock Text="Page 2" />
+          </TabItem>
+        </TabControl>
+      </Grid>
+
+      <materialDesign:DialogHost.DialogContent>
+        <Grid Margin="50">
+          <Button x:Name="NavigateHomeButton" Content="Navigate to Tab 1" Click="NavigateHomeButton_OnClick" />
+        </Grid>
+      </materialDesign:DialogHost.DialogContent>
+    </materialDesign:DialogHost>
+  </Grid>
+</UserControl>

MaterialDesignThemes.UITests/Samples/DialogHost/RestoreFocus.xaml.cs

@@ -0,0 +1,15 @@
+namespace MaterialDesignThemes.UITests.Samples.DialogHost;
+
+public partial class RestoreFocus : UserControl
+{
+    public RestoreFocus()
+    {
+        InitializeComponent();
+    }
+
+    private void NavigateHomeButton_OnClick(object sender, RoutedEventArgs e)
+    {
+        Wpf.DialogHost.CloseDialogCommand.Execute(null, null);
+        TabControl.SelectedItem = TabItem1;
+    }
+}

MaterialDesignThemes.UITests/WPF/DialogHosts/DialogHostTests.cs

@@ -349,5 +349,40 @@ await Wait.For(async () =>
             await closeButton.LeftClick();
             Assert.False(await dialogHost.GetIsOpen());
         });
+
+        recorder.Success();
+    }
+
+    [Fact]
+    [Description("Issue 3094")]
+    public async Task DialogHost_ChangesSelectedTabItem_DoesNotPerformTabChangeWhenRestoringFocus()
+    {
+        await using var recorder = new TestRecorder(App);
+
+        IVisualElement<Grid> rootGrid = (await LoadUserControl<RestoreFocus>()).As<Grid>();
+        IVisualElement<TabItem> tabItem1 = await rootGrid.GetElement<TabItem>("TabItem1");
+        IVisualElement<TabItem> tabItem2 = await rootGrid.GetElement<TabItem>("TabItem2");
+        IVisualElement<Button> navigateHomeButton = await rootGrid.GetElement<Button>("NavigateHomeButton");
+
+        // Select TabItem2
+        await tabItem2.LeftClick();
+
+        // Open menu
+        IVisualElement<MenuItem> menuItem1 = await rootGrid.GetElement<MenuItem>("MenuItem1");
+        await menuItem1.LeftClick();
+        await Task.Delay(1000); // Wait for menu to open
+        IVisualElement<MenuItem> menuItem2 = await rootGrid.GetElement<MenuItem>("MenuItem2");
+        await menuItem2.LeftClick();
+        await Task.Delay(1000); // Wait for dialog content to show
+
+        // Click navigate button
+        await navigateHomeButton.LeftClick();
+        await Task.Delay(1000); // Wait for dialog content to close
+
+        Assert.True(await tabItem1.GetIsSelected());
+        Assert.False(await tabItem2.GetIsSelected());
+
+        recorder.Success();
+
     }
 }