diff --git a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml
index ab62545..66a8958 100644
--- a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml
+++ b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml
@@ -8,22 +8,25 @@
     d:DesignWidth="800"
     mc:Ignorable="d">
     <StackPanel Spacing="20">
+        <UniformGrid Rows="3" Columns="3" Width="500" HorizontalAlignment="Left">
+            <UniformGrid.Styles>
+                <Style Selector="RadioButton">
+                    <Setter Property="Theme" Value="{DynamicResource PureCardRadioButton}" />
+                </Style>
+            </UniformGrid.Styles>
+            <RadioButton Click="PositionButton_OnClick" Content="TopLeft" />
+            <RadioButton Click="PositionButton_OnClick" Content="TopCenter" />
+            <RadioButton Click="PositionButton_OnClick" Content="TopRight" IsChecked="True" />
+            <RadioButton Click="PositionButton_OnClick" Content="BottomLeft" />
+            <RadioButton Click="PositionButton_OnClick" Content="BottomCenter" />
+            <RadioButton Click="PositionButton_OnClick" Content="BottomRight" />
+        </UniformGrid>
         <StackPanel Orientation="Horizontal" Spacing="20">
             <Button Click="NormalButton_OnClick" Content="Information" />
             <Button Click="NormalButton_OnClick" Content="Success" Classes="Success" />
             <Button Click="NormalButton_OnClick" Content="Warning" Classes="Warning" />
             <Button Click="NormalButton_OnClick" Content="Error" Classes="Danger" />
         </StackPanel>
-        <StackPanel Orientation="Horizontal">
-            <Button Click="PositionButton_OnClick" Content="TopLeft" />
-            <Button Click="PositionButton_OnClick" Content="TopCenter" />
-            <Button Click="PositionButton_OnClick" Content="TopRight" />
-        </StackPanel>
-        <StackPanel Orientation="Horizontal">
-            <Button Click="PositionButton_OnClick" Content="BottomLeft" />
-            <Button Click="PositionButton_OnClick" Content="BottomCenter" />
-            <Button Click="PositionButton_OnClick" Content="BottomRight" />
-        </StackPanel>
         <StackPanel Orientation="Horizontal" Spacing="20">
             <StackPanel.Styles>
                 <Style Selector="Button">
diff --git a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
index 63a252f..4392a7a 100644
--- a/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Pages/NotificationDemo.axaml.cs
@@ -22,6 +22,15 @@ public partial class NotificationDemo : UserControl
         _manager = new WindowNotificationManager(topLevel) { MaxItems = 3 };
     }
 
+    private void PositionButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        if (sender is RadioButton b && b.Content is string s)
+        {
+            Enum.TryParse<NotificationPosition>(s, out var t);
+            _manager.Position = t;
+        }
+    }
+
     private void NormalButton_OnClick(object? sender, RoutedEventArgs e)
     {
         if (sender is Button b && b.Content is string s)
@@ -32,16 +41,6 @@ public partial class NotificationDemo : UserControl
         }
     }
 
-    private void PositionButton_OnClick(object? sender, RoutedEventArgs e)
-    {
-        if (sender is Button b && b.Content is string s)
-        {
-            Enum.TryParse<NotificationPosition>(s, out var t);
-            _manager.Position = t;
-            _manager?.Show(new Notification(t.ToString(), "This is message"));
-        }
-    }
-
     private void LightButton_OnClick(object? sender, RoutedEventArgs e)
     {
         if (sender is Button b && b.Content is string s)