Flash CS3 : Create Dynamic Text Box with Scrollbar

var url:String = "menu.txt";
var loadit:URLLoader = new URLLoader();
loadit.addEventListener(Event.COMPLETE, completeHandler);
loadit.load(new URLRequest(url));

function completeHandler(event:Event):void {
    menu.text = event.target.data as String;
    mytext_scroll.update();
}

modified from :

http://www.tyronedavisjr.com/2007/12/03/flash-cs3-uiscrollbar-scroll-arrows-not-displaying-on-dynamic-text/