Loader Object doesn't dispatch Event.COMPLETE

Question

I am using this class to load multiple images synchronously. Somehow the loader doesn't trigger any event (Event.COMPLETE, ProgressEvent.PROGRESS), strangely I also don't get any errors (using FlashDevelop and Flex3 SDK).

package  
{
    import flash.display.Loader;
    import flash.display.Sprite;
    import flash.events.*;
    import flash.net.URLRequest;

    public class MultiImgLoader extends EventDispatcher
    {
        private var img_array:Array;
        public var images:Array;
        private var loader:Loader = new Loader();

        public function MultiImgLoader(img_array:Array) 
        {
            this.img_array = img_array;
            trace("[MultiImgLoader] about to load " + img_array.length);
            if (img_array.length > 0)
            {
                load(img_array[0]);
            }
        }

        private function load(img:String):void
        {
            trace("[MultiImgLoader] load " + img);
            loader.addEventListener(ProgressEvent.PROGRESS, progress);
            loader.addEventListener(Event.COMPLETE, this.ready);
            var req:URLRequest = new URLRequest(img);
            loader.load(req);
        }

        public function ready(ev:Event):void
        {
            var key:String = ev.target.contentLoaderInfo.url;
            trace("[MultiImgLoader] ready " + key);
            images.push( { key : ev.target } );
            if (img_array.length > images.length)
            {
                for (var i:int = 0; i < img_array.length; i++ )
                {
                    if (img_array[i] == key)
                    {
                        load(img_array[i+1]);
                    }
                }
            }
        }

        public function progress(ev:ProgressEvent):void
        {
            trace(ev.bytesLoaded);
        }

    }

}

Answer 1

Ok, got it. This:

loader.addEventListener(ProgressEvent.PROGRESS, progress);
loader.addEventListener(Event.COMPLETE, this.ready);

should read this:

loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, progress);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, ready);

I don't even know why the Loader-Class has the addEvenListener method - redundancy anyone?