Flex: Carga de modulo dinamica em Action Script 3

gistfile1.as

[Bindable]
protected var moduleInfo: IModuleInfo; 

protected function menuClick(event:MenuEvent):void
{
	var className:String = event.item.@data;
	
	var executa:Function = function():void
	{
		var definition:Class = Class(getDefinitionByName(className));
		var instance:MDIWindow = new definition();
		
		parentDocument.mdiCanvas.windowManager.add(instance);
	};
	
	getDefinitionByNameWrapper(executa);
}

private function getDefinitionByNameWrapper(callback:Function):void
{
	try {
		callback.call();
	}
	catch(e:Error){
		tryLoadModule(callback);
	}
}

private function tryLoadModule(callback:Function):void
{
	var postLoad:Function = function(e:Event):void { callback.call(); };
	
	moduleInfo = ModuleManager.getModule("modules/xpto.swf");
	moduleInfo.addEventListener(ModuleEvent.READY, postLoad);
	moduleInfo.addEventListener(ModuleEvent.ERROR, moduleError);
	moduleInfo.load(ApplicationDomain.currentDomain, null, null, moduleFactory);
}