Delphi DBGridEh属性

procedure TFramlc_yyxx.DBGrid2TitleBtnClick(Sender: TObject; ACol: Integer;
Column: TColumnEh);

begin

if Column.Title.SortMarker=smDownEh then
     dm.Szk_dlxx.Sort:=column.FieldName
else
    dm.Szk_dlxx.Sort:=column.FieldName +' DESC';

end;
代码如上，编译后会提示:undeclared identifier:'smdowneh'。问题出在哪里？

undeclared identifier:'smdowneh'
未定义的字段smdowneh