Avalonia/samples/ControlCatalog/Pages/NotificationsPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.NotificationsPage">
  <StackPanel Orientation="Vertical" Spacing="4" HorizontalAlignment="Left">
        <TextBlock Classes="h1">Notifications</TextBlock>
        <Button Content="Show Standard Managed Notification" Command="{Binding ShowManagedNotificationCommand}" />
        <Button Content="Show Custom Managed Notification" Command="{Binding ShowCustomManagedNotificationCommand}" />
        <Button Content="Show Native Notification" Command="{Binding ShowNativeNotificationCommand}" />
    </StackPanel>
</UserControl>