private TreeNode LoadTree(FdoParseable obj)
 {
     if (obj.ParseableType == FdoParseableType.Filter)
     {
         return(LoadFilterTree((FdoFilter)obj));
     }
     else //Expression
     {
         return(LoadExpressionTree((FdoExpression)obj));
     }
 }
 public ExpressionDisplayDialog(FdoParseable obj)
     : this()
 {
     try
     {
         trvStructure.BeginUpdate();
         trvStructure.Nodes.Add(LoadTree(obj));
     }
     finally
     {
         trvStructure.EndUpdate();
     }
 }