Adobe AIR - how to center default preloader.

Today I've came up with such a problem. How to center default preloader in Adobe AIR app (assuming that app starting size is not default).

After digging through Flex SDK, I've found a solution:

// handler for preinitialize event in s:windowedApplication tag
public function preinitializeHandler(event:Event):void
{
 centerPreloader();
}

// set nativeWindow.width & height in your app descriptor file
private function centerPreloader():void
{
 var preloader:Preloader = 
    systemManager.mx_internal::preloader as Preloader;
 if(preloader)
 {
  var preloaderDisplay:IPreloaderDisplay 
    = preloader.getChildAt(0) as IPreloaderDisplay;
  preloaderDisplay.stageWidth = nativeWindow.width;
  preloaderDisplay.stageHeight = nativeWindow.height;
 }
}