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Add loading complete event for URLLoader

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">     <mx:Script>                      private var _countriesService:URLLoader;             private var _statesService:URLLoader;             private function initializeHandler(event:Event):void {                 _countriesService = new URLLoader();                 _countriesService.addEventListener(Event.COMPLETE, countriesCompleteHandler);                 _countriesService.load(new URLRequest("http://localhost/countries.xml"));             }             private function countriesCompleteHandler(event:Event):void {                 var xml:XML = new XML(_countriesService.data);                 country.dataProvider = xml.children();             }                 private function changeHandler(event:Event):void {                 var request:URLRequest = new URLRequest("http://localhost/state.php");                 var parameters:URLVariables = new URLVariables();                 parameters.country = country.value;                 request.data = parameters;                 _statesService.load(request);             }            </mx:Script>     <mx:VBox>         <mx:ComboBox id="country" change="changeHandler(event)" />     </mx:VBox> </mx:Application>