Porting gallery code from Flash to seperate class

programming flash
1

I have an xml gallery sort of that works fine when I have the code not as a class, in first frame in Flash.

So I decided I wanted to port it into a class and the problem I get is at:
thumb = new Thumbnail(xmlList.image);*
It expects 0 arguments. How come that line of code works in first frame in flash but not as a class?

There is a movieclip in the library called thumb with linkage of Thumbnail.

Below if the code when used in first frame:

var urlRequest:URLRequest = new URLRequest("pics.xml");
var urlLoader:URLLoader = new URLLoader();
var xml:XML;
var xmlList:XMLList;
urlLoader.load(urlRequest);
urlLoader.addEventListener(Event.COMPLETE,urlLoaded);

var arrayThumb:Array = new Array();
var photoContainer:Sprite =  new Sprite();
addChild(photoContainer);
photoContainer.mask=thumb_holder;


function urlLoaded(event:Event):void {
    xml = XML(event.target.data);
    xmlList = xml.children();
    trace(xmlList.length());
    for (var i:int=0; i<xmlList.length(); i++) {
        var thumb:Thumbnail = new Thumbnail(xmlList*.url);
        arrayThumb.push(thumb);
        arrayThumb*.y = 67.5;
        arrayThumb*.x = i*100+55;
        photoContainer.addChild(thumb);
    }
}

Here is the class

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.net.URLLoader;
    import flash.net.URLRequest;
    


    public class SliderClass2 extends Sprite{
    
        private var urlRequest:URLRequest;
        private var urlLoader:URLLoader;
        private var xml:XML;
        private var xmlList:XMLList;
        private var arrayThumb:Array = new Array();
        private var photoContainer:Sprite = new Sprite();
        private var thumb:Thumbnail;
    
        public function SliderClass2() {
        
        urlRequest= new URLRequest("images.xml");
        urlLoader = new URLLoader();
        
        urlLoader.load(urlRequest);
        urlLoader.addEventListener(Event.COMPLETE,urlLoaded);


        addChild(photoContainer);
        }

        function urlLoaded(event:Event):void {
            xml = XML(event.target.data);
            xmlList = xml.children();
            trace(xmlList.length());
            for (var i:int=0; i<xmlList.length; i++) {
            trace(xmlList*.image);
            thumb = new Thumbnail(xmlList*.image);
            //thumb = new Thumbnail();
            arrayThumb.push(thumb);
            arrayThumb*.y = 67.5;
            arrayThumb*.x = i*100+55;
            photoContainer.addChild(thumb);


        }
    }    
    
    }    
}