title: dispatch change value and start tween
body: <p>I try to make simple scorebug. It’s feed from external XML file.</p>
  
  <p>I want to start an animation when score changing, but i doesn’t found event listener or dispatcher to get change of value.</p>
  
  <pre><code>var myTimer:Timer = new Timer(100);
  myTimer.addEventListener(TimerEvent.TIMER, timerListener);
  myTimer.start();
  
  function timerListener (e:TimerEvent):void 
  {
      var myXMLLoader:URLLoader = new URLLoader();
      myXMLLoader.load(new URLRequest("Xml.xml"));
      myXMLLoader.addEventListener(Event.COMPLETE, processXML);
  
      function processXML (e:Event):void
      {
          var myXML:XML = new XML(e.target.data);
  
          ShotClock.text = myXML.timestamp;
          GameClock.text = myXML.Clock;
          HS.HomeScore.text = myXML.HomeScore;
          AS.AwayScore.text = myXML.AwayScore;
          Period.text = myXML.Period;
          AwayTeam.text = myXML.AwayName;
          HomeTeam.text = myXML.HomeName;
      }
  
      if ( (myXML.HomeScore).CHANGE ) 
      { var myTween:Tween = new Tween(HS.HomeScore, "alpha", Strong.easeIn, 0, 1, 1, true); }
  
  }
  </code></pre>