partial void DeleteMusicGroupXMusic(MusicGroupXMusic instance);
 partial void UpdateMusicGroupXMusic(MusicGroupXMusic instance);
		private void detach_MusicGroupXMusic(MusicGroupXMusic entity)
		{
			this.SendPropertyChanging();
			entity.MusicGroup = null;
		}
 partial void InsertMusicGroupXMusic(MusicGroupXMusic instance);
		private void attach_MusicGroupXMusic(MusicGroupXMusic entity)
		{
			this.SendPropertyChanging();
			entity.MusicGroup = this;
		}