Call metode in main from child class

programming flash
1

Hey

I have a child/ Background class there must call a metode in the main class.

But this fail coms: BackGround.as, Line 35 1061: Call to a possibly undefined method resizeHandler through a reference with static type flash.display:DisplayObjectContainer.

My main class:


    public class Main extends MovieClip
    {
        private var backGround:BackGround = new BackGround();
        private var menu:Menu_ = new Menu_();
        private var boks:Boks = new Boks();
        private var cases:Cases = new Cases();
        
        public function Main()
        {
            stage.scaleMode = StageScaleMode.NO_SCALE; 
            stage.align = StageAlign.TOP_LEFT; 
            stage.addEventListener(Event.RESIZE, resizeHandler); 
            
            addChild(backGround);
            addChild(menu);
            addChild(boks);
            boks.x = 10;    
            
            //resizeHandler(null);
        }
        
        public function resizeHandler(event:Event):void 
        {
            backGround.resizePic(stage.stageWidth,stage.stageHeight);
            //cases.resizePic(stage.stageWidth,stage.stageHeight);
            boks.y = stage.stageHeight;
        } 
    }

My Child/ Background Class


public class BackGround extends MovieClip {
        private var XML_:XML;
        private var Loader_:URLLoader = new URLLoader();
        private var container:MovieClip;

        public function BackGround() {
            Loader_.load(new URLRequest("backgrounds/backgrounds.xml"));
            Loader_.addEventListener(Event.COMPLETE, processXML);
        }
        
        private function processXML(e:Event):void {
            XML_ = new XML(e.target.data);
            
            var pic_url = XML_.IMAGE[0];

            var pic_loader = new Loader();
            pic_loader.load(new URLRequest(pic_url));
            pic_loader.contentLoaderInfo.addEventListener(Event.COMPLETE, picLoaded);
        }
        
        public function picLoaded (e:Event):void {
            var pic:Loader = Loader(e.target.loader);
            
            container = new MovieClip();
            addChild(container);
            container.addChild(pic);

            //------------------------------------------------
            //------------------------------------------------
            this.parent.resizeHandler(null);
            //------------------------------------------------
            //------------------------------------------------
        }
        
        public function resizePic(w:Number,h:Number):void
        {
            container.width = w;
            container.height = h;
        }
    }