How to abort exiting from a form

Hi.
I want to popup an Alert message which ask the user if he realy want to exit the Oracle Forms application. If he press 'NO' button I want to return to the aplication.
I realize that I have to use POST-FROM triger to popup the alert message. I then don't know how to unvalidate the user exit.
Any hint / example?
Regards,
Dezo

You van try this in Post-Form trigger:
DECLARE
alert_button NUMBER;
al_id Alert:= Find_Alert('your_alert');
BEGIN
Set_Alert_Property(al_id, alert_message_text,'Do you want to exit ?');
alert_button := Show_Alert(al_id);
IF alert_button=ALERT_BUTTON1 THEN
DO_KEY('Key_Exit');
ELSE
RAISE Form_Trigger_Failure;
END IF;
END;

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