Inheritance: INotifyPropertyChanging, INotifyPropertyChanged
 partial void DeleteGroup(Group instance);
 partial void UpdateGroup(Group instance);
		private void detach_Groups(Group entity)
		{
			this.SendPropertyChanging();
			entity.Role = null;
		}
 partial void InsertGroup(Group instance);
		private void attach_Groups(Group entity)
		{
			this.SendPropertyChanging();
			entity.Role = this;
		}