private static void OnDropDownProeprtyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MenuButton sender = (MenuButton)d;
sender.OnDropDownChanged(e.OldValue as ContextMenu, e.NewValue as ContextMenu);
}
internal static void SetParentMenuButton(ContextMenu obj, MenuButton value)
{
obj.SetValue(ParentMenuButtonProperty, value);
}