partial void DeleteSub(Sub instance);
 partial void UpdateSub(Sub instance);
		private void detach_Subs(Sub entity)
		{
			this.SendPropertyChanging();
			entity.Category = null;
		}
 partial void InsertSub(Sub instance);
		private void attach_Subs(Sub entity)
		{
			this.SendPropertyChanging();
			entity.Category = this;
		}