Something

    private function init():void {
                var loader:URLLoader = new URLLoader();
                var URL:URLRequest = new 
               URLRequest("http://domain.com/xml.php");
                loader.addEventListener(Event.COMPLETE, FillData);
                loader.load(URL);
            }
            private function FillData(event:Event):void {
                var x:XML = new XML(event.target.data);
                listbox.dataProvider = x.children();
                total.text = x.total;
                xmldata = x;
                ClientName.dataProvider = x.dataset.username;
                trace("Username" + x.dataset.username.toXMLString());
            }