using Microsoft.Toolkit.Win32.UI.XamlHost; using Windows.ApplicationModel.Activation; using Windows.UI.Xaml; namespace TheXamlGuy.TaskbarGroup.Flyout { public sealed partial class App : XamlApplication { public App() { Initialize(); } protected override void OnLaunched(LaunchActivatedEventArgs args) { (Window.Current as object as IWindowPrivate).TransparentBackground = true; base.OnLaunched(args); } } }