Pausing or stopping a game on deactivate

Hi guys...

I am using flash builder 4.6 and I am creating an AIR game (for mobile) ... I used to use Flash Pro (CS6) before and, to pause the game I have used:

NativeApplication.nativeApplication.addEventListener(Event.DEACTIVATE, onDeactivate);

function onDeactivate(e:Event):void {

stop();

}

and that was possible, of course, because Flash Pro is based on timeline...

Now... how can I do the same with Flash Builder?

Thanks!!!