WHEN-WINDOWS-DEACTIVATED

Hi All,

in Forms 11g R2 (11.1.2.2.0), from our menu (tree), I use OPEN_FORM (  ACTIVATE , SESSION ) to open two forms for example A and B . In form A I have a java bean timer and form B is a simple data entry form. I would like to switch off form A timer when I go to form B and switch it on when I come back to form A. I have tried WHEN-WINDOWS-DEACTIVATED trigger in form A to switch off the timer and switch it on in form A WHEN-WINDOWS-ACTIVATED trigger, but it seems WHEN_WINDOWS_DEACTIVATED trigger does not