>Does your "cursor open code" written in interactive change event or lost focus event of the combo box ?

The issue was that the combo box sometimes accepts a single alpha letter, such as "G" and then proceeds as if we had entered "G + enter key".

If I understand your question above, we want to lose focus, and pop open a cursor (grid). The grid opens okay, regardless.
>
>and check whether set confirm is off
>
Confirm is OFF

>Raj