Maros,

Just to point out something about the destruct sequence in VFP, by the time the Destroy() method of outermost container (your form) fires all of the contained objects have already destructed.

>I create main SDI form of my app. I want avoid of user to immediately closing main form clicking on close button on upper-right corner of form. I add to destroy event of form next few lines.
>
>if messagebox('Do you really quit application?',36)=1
> clear events
>else
> return .f.
>endif
>
>If user answer Yes, form close. It is o.k. If user answer No, form close too. How can I prevent closing form, if some condition is not meet.