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Add event listener for unloading a module with ActionScript

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">   <mx:Script>            import mx.events.FlexEvent;       import mx.events.ModuleEvent;       import mx.modules.ModuleManager;              private var flag:Boolean = true;       private var dynamicModule:ModuleLoader;              private function changeMac():void        {             dynamicModule = new ModuleLoader();             dynamicModule.url = "a.swf";             dynamicModule.addEventListener( ModuleEvent.UNLOAD, eventHandler );             this.addChild( dynamicModule );                dynamicModule.loadModule();             dynamicModule.unloadModule();       }              private function eventHandler( event:Event ):void       {         trace( "Control: " + event.currentTarget + " type: " + event.type );       }      </mx:Script>   <mx:Button label="Change Mac" click="changeMac()" />   <mx:ModuleLoader id="mlRuntimeCSS"                      url="a.swf"                     loading="eventHandler( event )"                     progress="eventHandler( event )"                     ready="eventHandler( event )"                     setup="eventHandler( event )"                     unload="eventHandler( event )" />   <mx:ModuleLoader id="mlDateWidget2"                     url="a.swf"                     loading="eventHandler( event )"                     progress="eventHandler( event )"                     ready="eventHandler( event )"                     setup="eventHandler( event )"                     unload="eventHandler( event )" />      </mx:Application>