public async Task RegisterWindowAsync(PortableAppWindow window, INativeAppWindow nativeWindow)
{
// Wait till InitializeAsync finishes
await InitializeTask;
window.Register(nativeWindow);
// Add the window
Windows.Add(window);
}
internal void Register(INativeAppWindow nativeWindow)
{
NativeAppWindow = nativeWindow;
NativeAppWindow.Register(this);
NativeAppWindow.BackPressed += NativeAppWindow_BackPressed;
}