private void ItemsContainer_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
var objType = Type.GetType("AnimationGallery.AnimationUI." + ItemsContainer.SelectedItem, true);
_currentAnimationCtrl = (IAnimation)Activator.CreateInstance(objType);
ContentContainer.Content = _currentAnimationCtrl;
_currentAnimationCtrl.BeignAnimation();
}