Untitled

package
{
  import flash.display.Sprite;
  import flash.display.StageAlign;
  import flash.display.StageScaleMode;
  import flash.events.Event;

  [SWF(width="100", height="100"]

  public class Main extends Sprite
  {
    public function Main()
    {
      addEventListener(Event.ADDED_TO_STAGE, onAdded, false, 0, true);
    }

    protected function onAdded(event:Event):void
    {
      removeEventListener(Event.ADDED_TO_STAGE, onAdded);
      stage.addEventListener(Event.RESIZE, onResize, false, 0, true);

      stage.scaleMode = StageScaleMode.NO_SCALE;
      stage.align = StageAlign.TOP_LEFT;
    }

    protected function onResize(event:Event):void
    {
      button.width = stage.stageHeight;
      button.height = stage.stageHeight;
    }
  }
}