TAdvStringGrid - checkbox

I'm using v 6.1.1. I've added checkboxes to a column using AddCheckboxColumn. It seems that to change the value of the check box at runtime, I need to click in the cell and then click again. Is it possible to toggle the change by just clicking once?

We cannot see a problem.
Was tested with default grid on the form and the code:

procedure TForm1.FormCreate(Sender: TObject);
  advstringgrid1.Options := advstringgrid1.Options + [goEditing];

and this works without any issue. Checkbox toggles on the first click.