addChild problem using Class

programming flash
1

Hi,

I am new into working with classes and I have a problem with addChild.
First I have a class called ThumbGrid in an external actionscript3 file:

 
package {
 import flash.display.*;
 import flash.events.*;
 import flash.net.*;
 
 public class ThumbGrid {
  private var pHeight:Number = 100;
  private var pWidth:Number = 75;
  private var listLoader:URLLoader = new URLLoader( new URLRequest("filelist.xml") );
  private var arrPicLoaders:Array = new Array();
  private var arrPicList:Array = new Array();
  private var numImages:Number;
  private var stImagedir:String = "pix/";
  public function ThumbGrid():void {
   trace("constructor");
   //constructor
   
   listLoader.addEventListener(Event.COMPLETE, makePictureLoader);
  }
  private function makePictureLoader(e:Event):void {
   trace("function: makePictureLoader");
   //lees XML
     var xmlData:XML = XML(listLoader.data);
   numImages = xmlData.pix.length(); //aantal images
   //shuffelen maar, resultaat in arrShuffled 
   //var arrShuffled:Array = shuffleList(numImages);
 
   var stImage:String;
   for (var i=0; i<numImages; i++) {
      //stImage = xmlData.pix[arrShuffled*].toString();
      stImage = xmlData.pix*.toString();
    trace (stImagedir+stImage);
    arrPicLoaders* = new Loader();
    arrPicLoaders*.contentLoaderInfo.addEventListener(Event.COMPLETE, makePictureList);
    arrPicLoaders*.load( new URLRequest(stImagedir+stImage) );
   }
   listLoader.removeEventListener(Event.COMPLETE, makePictureLoader);
  }
  private function makePictureList(e:Event):void {
   trace("function: makePictureList");
   
   //vul het bitmap object en stel de properties in
   var thisBmp:Bitmap = Bitmap(e.target.content);
   var thisWidth:Number = thisBmp.width;
   var thisHeight:Number = thisBmp.height;
   thisBmp.scaleX = pWidth/thisWidth;
   thisBmp.scaleY = pHeight/thisHeight;
   //voeg bitmap to aan array
   arrPicList.push(thisBmp);
  }
  
  private function showPictureList():void {
   trace("function: showPictureList");
   var container1:DisplayObject;
   var nNextheight:Number = 0;
   //lees array
   for (var i=0; i<arrPicList.length; i++) {
    //maak rijen van 6 plaatjes
    if (i%6==0) nNextheight += pHeight;
    arrPicList*.x = pWidth*Math.floor(i%6);    //pWidth*Math.floor(i/2);
    arrPicList*.y = nNextheight-pHeight;
    addChild(arrPicList*); //laat maar zien
   }
  }
 }
}

In my fla file I instantiate the class. At that point an XML file is read and from that file images are being loaded into Bitmap objects and then gathered in an array.
After instantiating I call the method showPictureList.


 
var grid:ThumbGrid = new ThumbGrid();
grid.showPictureList();

If I test the fla file I get the following error:

[COLOR=red]1180: Call to a possibly undefined method addChild.[/COLOR]

What am I doing wrong?

thx. Arjo