<?xml version="1.0" encoding="utf-8"?>
  <!-- http://blog.flexexamples.com/2007/08/07/creating-full-screen-flex-applications/ -->
  <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" applicationComplete="init()">
  
      <mx:Script>
          <![CDATA[
              import flash.display.StageDisplayState;
              import mx.managers.SystemManager;
  
              private function init():void {
                  /* Set up full screen handler. */
                  systemManager.stage.addEventListener(FullScreenEvent.FULL_SCREEN, fullScreenHandler);
                  dispState = systemManager.stage.displayState;
              }
  
              private function fullScreenHandler(evt:FullScreenEvent):void {
                  dispState = systemManager.stage.displayState + " (fullScreen=" + evt.fullScreen.toString() + ")";
                  if (evt.fullScreen) {
                      /* Do something specific here if we switched to full screen mode. */
                  } else {
                      /* Do something specific here if we switched to normal mode. */
                  }
              }
  
              private function toggleFullScreen():void {
                  try {
                      switch (systemManager.stage.displayState) {
                          case StageDisplayState.FULL_SCREEN:
                              /* If already in full screen mode, switch to normal mode. */
                              systemManager.stage.displayState = StageDisplayState.NORMAL;
                              break;
                          default:
                              /* If not in full screen mode, switch to full screen mode. */
                              systemManager.stage.displayState = StageDisplayState.FULL_SCREEN;
                              break;
                      }
                  } catch (err:SecurityError) {
                      // ignore
                  }
              }
          ]]>
      </mx:Script>
  
      <mx:String id="dispState" />
  
      <mx:Label text="width={Application.application.width}" />
      <mx:Label text="height={Application.application.height}" />
      <mx:Label text="displayState={dispState}" />
  
      <mx:Button label="Toggle fullscreen" click="toggleFullScreen()" />
  
  </mx:Application>