protected virtual void OnTroefChanged(object sender, TroefChangedEventArgs e)
{
if (TroefChanged != null)
TroefChanged(sender, e);
}
private void GameEngine_OnTroefIsChanged(object sender, TroefChangedEventArgs e)
{
ImgTroef.Source = new BitmapImage(new Uri("ms-appx:/Images/" + e.Troef + ".png", UriKind.RelativeOrAbsolute));
}