XAML-Map-Control/SampleApps/WinUiApp/App.xaml.cs

using Microsoft.UI.Xaml;

namespace SampleApplication;

public partial class App : Application
{
    private Window window;

    public App()
    {
        InitializeComponent();
    }

    protected override void OnLaunched(LaunchActivatedEventArgs args)
    {
        window = new MainWindow();
        window.Activate();
    }
}