/// <summary>
/// Repositions an item in the animation list, moving it down one slot.
/// </summary>
private void DownButton_Click(object sender, RoutedEventArgs e)
{
Visualization item = (Visualization)visAnimGrid.SelectedItem;
int index = VisAnimItems.IndexOf(item);
Debug.Assert(index >= 0 && index < VisAnimItems.Count - 1);
VisAnimItems.Remove(item);
VisAnimItems.Insert(index + 1, item);
visAnimGrid.SelectedIndex = index + 1;
visAnimGrid.ScrollIntoView(item);
//RefreshAnim();
}
