diff --git a/demo/Semi.Avalonia.Demo.Desktop/Program.cs b/demo/Semi.Avalonia.Demo.Desktop/Program.cs
index 8c96283..d42b109 100644
--- a/demo/Semi.Avalonia.Demo.Desktop/Program.cs
+++ b/demo/Semi.Avalonia.Demo.Desktop/Program.cs
@@ -1,5 +1,6 @@
 using System;
 using Avalonia;
+using Avalonia.Dialogs;
 using Avalonia.Media;
 
 namespace Semi.Avalonia.Demo.Desktop;
@@ -26,6 +27,7 @@ class Program
     // Avalonia configuration, don't remove; also used by visual designer.
     public static AppBuilder BuildAvaloniaApp()
         => AppBuilder.Configure<App>()
+            .UseManagedSystemDialogs()
             .UsePlatformDetect()
             .With(new Win32PlatformOptions())
             .LogToTrace();
diff --git a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
index 0b65d5e..bdaf029 100644
--- a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
@@ -12,7 +12,7 @@ namespace Semi.Avalonia.Demo.Pages;
 
 public partial class NotificationDemo : UserControl
 {
-    private MainWindow? _window;
+    private WindowNotificationManager _manager;
     public NotificationDemo()
     {
         InitializeComponent();
@@ -21,14 +21,15 @@ public partial class NotificationDemo : UserControl
     protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
     {
         base.OnAttachedToVisualTree(e);
-        _window = VisualRoot as MainWindow;
+        var topLevel = TopLevel.GetTopLevel(this);
+        _manager = new WindowNotificationManager(topLevel){ MaxItems = 3};
     }
 
     private void InfoButton_OnClick(object? sender, RoutedEventArgs e)
     {
         if (sender is Button b && b.Content is string s && Enum.TryParse<NotificationType>(s, out NotificationType t))
         {
-            _window?.Notify(t);
+            _manager.Show(new Notification(t.ToString(), "This is message", t));
         }
     }
 }
\ No newline at end of file
diff --git a/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs b/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
index 4ff746b..aabf593 100644
--- a/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Views/MainWindow.axaml.cs
@@ -5,19 +5,8 @@ namespace Semi.Avalonia.Demo.Views;
 
 public partial class MainWindow : Window
 {
-    private readonly WindowNotificationManager _manager;
     public MainWindow()
     {
         InitializeComponent();
-        _manager = new WindowNotificationManager(this)
-        {
-            Position = NotificationPosition.TopLeft,
-            MaxItems = 3
-        };
-    }
-    
-    internal void Notify(NotificationType t)
-    {
-        _manager.Show(new Notification(t.ToString(), "This is a notification message", t));
     }
 }
\ No newline at end of file