void OnListBoxItemUnselected(object sender, RoutedEventArgs e)
{
// When the user brings a new ListBoxItem to the front of the 3D scene
// it becomes the selected item in the ListBox. At that time, we must
// verify that the previously selected item's front side is facing forward.
DependencyObject depObj = e.OriginalSource as DependencyObject;
while (depObj != null)
{
if (VisualTreeHelper.GetChildrenCount(depObj) == 0)
{
break;
}
depObj = VisualTreeHelper.GetChild(depObj, 0);
ContentControl3D cc3D = depObj as ContentControl3D;
if (cc3D != null)
{
cc3D.BringFrontSideIntoView();
break;
}
}
}
