Listeners for the Event.RESIZE event must be registered with Flash Player's Stage instance,

 
package {
  import flash.display.*;
  import flash.events.*;

  public class Main extends Sprite {
    public function Main(  ) {
      stage.scaleMode = StageScaleMode.NO_SCALE;
      stage.addEventListener(Event.RESIZE, resizeListener);
    }

    private function resizeListener (e:Event):void {
      trace("Flash Player was resized");
    }
  }
}

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Listeners for the Event.RESIZE event must be registered with Flash Player's Stage instance, : Event « Development « Flash / Flex / ActionScript

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