public void Add <TAtt>(TAtt att) where TAtt : Xarial.VPages.Framework.Base.IAttribute
 {
     m_BaseAttSet.Add <TAtt>(att);
 }
 public void Add <TAtt>(TAtt att) where TAtt : XCad.UI.PropertyPage.Base.IAttribute
 {
     m_BaseAttSet.Add <TAtt>(att);
 }