RxDBGrid checkbox field issues

[lainz]

Hi, when the user searchs the grid and there's no result. There is an empty row with the checkbox usable. So the user selects the checkbox and gets the following error: (attached)

Please fix this in order to display nothing, or don't allow to edit that empty row.

I've tried this code without success:

Code: Pascal  [Select][+][-]

1.     if not sqlqyProductos1.IsEmpty then
2.     begin
3.       sqlqyProductos1.First;
4.       dbgProductos.ReadOnly := False;
5.       dbgProductos.Columns[0].ReadOnly := False;
6.       dbgProductos.Columns[0].DirectInput := True;
7.     end
8.     else
9.     begin
10.       dbgProductos.ReadOnly := True;
11.       dbgProductos.Columns[0].ReadOnly := True;
12.       dbgProductos.Columns[0].DirectInput := False;
13.     end;