actionscript 3 - Back button for android is not working for apk file -

i using flash cs6 create android app. trying code button. works when run file in flash after published out handphone, button brings me page 3 page 1 instead of page 3 page 2. doing coding in frame , not class.

the code have used below:

import flash.events.mouseevent; import flash.events.keyboardevent; import flash.desktop.nativeapplication;  stop(); nativeapplication.nativeapplication.addeventlistener(keyboardevent.key_down, onkeydownhandler159)  function onkeydownhandler159(event:keyboardevent):void {     if( event.keycode == keyboard.back)     {          event.preventdefault();          event.stopimmediatepropagation();          nativeapplication.nativeapplication.removeeventlistener(keyboardevent.key_down, onkeydownhandler159);          gotoandstop (14);          nativeapplication.nativeapplication.addeventlistener(keyboardevent.key_down, onkeydownhandler159)     } } 

try using keyboardevent.key_up rather key_down. key down can interpreted in different ways, on mobile device. i've never had issues key up