public GalleryPreviewControl()
{
HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Stretch;
VerticalAlignment = Windows.UI.Xaml.VerticalAlignment.Stretch;
Transitions = new Windows.UI.Xaml.Media.Animation.TransitionCollection();
Transitions.Add(new Windows.UI.Xaml.Media.Animation.RepositionThemeTransition());
}