protected UserControl GetContainingScreen()
{
var userControlAncestors = this.AssociatedObject.GetSelfAndAncestors().OfType <UserControl>();
// Find the first screen up the visual tree, so that we can invoke state on the proper UserControl
var screen = userControlAncestors.FirstOrDefault(userControl => InteractionContext.IsScreen(userControl.GetType().FullName));
// If we couldn't find a hosting screen, take the first UserControl we find.
return(screen ?? userControlAncestors.First());
}