private static void OnConstrainToParentBoundsChanged(object sender, DependencyPropertyChangedEventArgs args)
{
MouseDragElementBehavior b = (MouseDragElementBehavior)sender;
b.UpdatePosition(new Point(b.X, b.Y));
}
private static void OnYChanged(object sender, DependencyPropertyChangedEventArgs args)
{
MouseDragElementBehavior dragBehavior = (MouseDragElementBehavior)sender;
dragBehavior.UpdatePosition(new Point(dragBehavior.X, (double)args.NewValue));
}