title: Close Xamarin.Forms DisplayAlert
body: <p>Is there any way to close a Xamarin.Forms <a href="https://developer.xamarin.com/guides/xamarin-forms/user-interface/navigation/pop-ups/" rel="noreferrer">DisplayAlert</a> without user interaction?
  There is no <code>CancellationToken</code> that I can provide.
  So how can I cancel it?</p>