procedure TForm9.Button1Click(Sender: TObject);
var i:integer;
    s:string[30];
begin
  Case pagecontrol1.ActivePageIndex of
  0: begin
     with mdb.DataModule2.Person do
       begin
       For i:=0 to form1.DBGrid1.FieldCount-1 do
         If form1.DBGrid1.Columns[i].Title.Caption=radiogroup1.Items[radiogroup1.ItemIndex] then
           begin
           s:=form1.DBGrid1.Columns[i].FieldName;
           break;
           end;
       end;
     mdb.DataModule2.Person.AddIndex(s+'index',s,[]);
     mdb.DataModule2.Person.IndexName:=s+'index';
     end;
  end;
end;