Inheritance: INotifyPropertyChanging, INotifyPropertyChanged
 partial void DeleteIssueTypeDetail(IssueTypeDetail instance);
 partial void InsertIssueTypeDetail(IssueTypeDetail instance);
 partial void UpdateIssueTypeDetail(IssueTypeDetail instance);
		private void detach_IssueTypeDetails(IssueTypeDetail entity)
		{
			this.SendPropertyChanging();
			entity.IssueTypeDetail1 = null;
		}