public IShowTag CreateShowTag( Guid showId, Guid tagId, Guid userId )
        {
            ShowTag tag = new ShowTag() {
                Id = Guid.NewGuid(),
                ShowId = showId,
                TagId = tagId,
                UserId = userId
            };

            return tag;
        }
		private void detach_ShowTags(ShowTag entity)
		{
			this.SendPropertyChanging();
			entity.Show = null;
		}
		private void attach_ShowTags(ShowTag entity)
		{
			this.SendPropertyChanging();
			entity.Show = this;
		}