highlight current Index label in list component

Hi,

I'm writhing http xml video playlist. i was took 'List' component for playlist.

if i click on label, that is working (i mean playing video & highlighting label).

but after video ending, video automatically playing but label not highlighting, How can i highlight current playing video label?

Code:

var videoURL:String = "playlist_http.xml";
var bolLoaded:Boolean;;
var intActiveVid:int;
var urlLoader:URLLoader;
var urlRequest:URLRequest;
var xmlPlaylist:XML;
var nConnection:NetConnection;
var ns:NetStream;
var video:Video = new Video();
nConnection = new NetConnection();
nConnection.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
nConnection.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
nConnection.connect(null);
function connectStream():void
{
          ns = new NetStream(nConnection);
          ns.addEventListener(NetStatusEvent.NET_STATUS, netStatusHandler);
          ns.addEventListener(AsyncErrorEvent.ASYNC_ERROR, ayncErrorHandler);
          ns.checkPolicyFile = true;
          ns.client = this;
          vidDisplay.attachNetStream(ns);
          ns.play(videoURL);
          vidDisplay.smoothing = true;
  
          urlRequest = new URLRequest(videoURL);
          urlLoader = new URLLoader();
          urlLoader.addEventListener(Event.COMPLETE, playlistLoaded);
          urlLoader.load(urlRequest);
}
function netStatusHandler(event:NetStatusEvent):void
{
          trace(event.info.code);
          switch (event.info.code)
          {
                    case "NetConnection.Connect.Success" :
                              connectStream();
                              break;
  
                    case "NetConnection.Connect.Closed" :
                              break;
                    case "NetStream.Play.Stop" :
                              playNext();
                              break;
                    default :
          }
}
function securityErrorHandler(event:SecurityErrorEvent):void
{
          trace("securityErrorHandler: " + event);
}
function ayncErrorHandler(event: AsyncErrorEvent):void
{
          //Nothing
}
//PlayList SetUp
//=====================
  
var listBox:List = new List();
addChild(listBox);
listBox.setSize(194, 339);
listBox.move(484,0); 
function playlistLoaded(e:Event):void {
          xmlPlaylist = new XML(urlLoader.data);
          //trace(xmlPlaylist.vid[0].@src);
                      
    for (var i:int=0;i<xmlPlaylist.vid.length();i++) {
                              listBox.addItem({label:xmlPlaylist.vid.attribute("desc"), data:xmlPlaylist.vid.@src});
                              listBox.addEventListener(Event.CHANGE, playVidlist);
                              listBox.selectedIndex = 0;
          }
                      
// set source of the first video but don't play it
          playVid(0, false);
  
          if(!bolLoaded) {
                    ns.play(videoURL);
                    bolLoaded = true;
          }
          else{
                    ns.resume();
          }
}
function playVidlist(e:Event):void
{
          //intActiveVid=int(String(e.currentTarget.selectedItem.data));
          ns.play(String(e.currentTarget.selectedItem.data));
          lblDescription.text = e.currentTarget.selectedItem.label;
  
          if(!bolLoaded) {
                    ns.play(videoURL);
                    bolLoaded = true;
          }
          else{
                    ns.resume();
          }
}
function playVid(intVid:int = 0, bolPlay = true):void {
          if(bolPlay) {
                    // play requested video
                    ns.play(String(xmlPlaylist..vid[intVid].@src));
          } else {
                    videoURL = xmlPlaylist..vid[intVid].@src;
          }
          lblDescription.text = String(xmlPlaylist..vid[intVid].@desc);
          // update active video number
          intActiveVid = intVid;
}
function playNext(e:MouseEvent = null):void {
          if(intActiveVid + 1 < xmlPlaylist..vid.length()){
                              playVid(intActiveVid + 1);
          }
}
  
function playPrevious(e:MouseEvent = null):void {
          // check if we're not and the beginning of the playlist and go back
          if(intActiveVid - 1 >= 0)
                    playVid(intActiveVid - 1);
}