You have to issue NODEFAULT in the QueryUnload event if you want to prevent a form from closing.

>I have IF statement in Destroy event of Form class in which if it is .F. I need to stop Destroy event.
>
>Scenario is actually like this: user clicks Close button (red "X" button of Form) and if IF condition is .F. then Form must not be closed.
>
>How to do that?