public IUsingDirective AddUsingDirective(IUsingDirective usingDirective)
 {
     StemMembersAll.AddOrMove(usingDirective);
     return(usingDirective);
 }
 public INamespace AddNamespace(INamespace nspace)
 {
     StemMembersAll.AddOrMove(nspace);
     return(nspace);
 }