partial void Deletemenu(menu instance);
 partial void Updatemenu(menu instance);
		private void detach_menus(menu entity)
		{
			this.SendPropertyChanging();
			entity.menutype = null;
		}
 partial void Insertmenu(menu instance);
		private void attach_menus(menu entity)
		{
			this.SendPropertyChanging();
			entity.menutype = this;
		}