Наведение и уведения мышки с объекта

private var sprite:Sprite = new Sprite();
private var loader:Loader = new Loader();
private var url1:URLRequest,
url2:URLRequest;
 
this.sprite.graphics.lineStyle(1,0x000000);
this.sprite.graphics.drawRect(0, 0, 400, 50);
this.sprite.graphics.endFill();
 
this.url1 = new URLRequest('http://localhost/normal.png');
this.url2 = new URLRequest('http://localhost/hover.png');
 
this.loader(this.url1);
 
this.sprite.addChild(this.loader);

this.loader.addEventListener(MouseEvent.MOUSE_OVER, this.onMouseOver);
this.loader.addEventListener(MouseEvent.MOUSE_OUT, this.onMouseOut);

private function onMouseOver(event:MouseEvent):void {
    Mouse.cursor = MouseCursor.BUTTON;
    this.loader.load(this.url2);
}
        
private function onMouseOut(event:MouseEvent):void {
    Mouse.cursor = MouseCursor.ARROW;
    this.loader.load(this.url1);
}

package {
    import flash.display.Sprite;
    import flash.display.DisplayObject;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.ui.Mouse;
    import flash.ui.MouseCursor;
    
    public class Main extends Sprite {
        
        private var classNormal:DisplayObject,
                    classHover:DisplayObject;
        
        private var normal:Sprite = new Sprite(),
                    hover:Sprite = new Sprite();
        
        [Embed(source = 'normal.png')]
        private var Normal:Class;
        
        [Embed(source = 'hover.png')]
        private var Hover:Class;
        
        public function Main():void {
            if(super.stage) {
                this.init();
            } else {
                super.addEventListener(Event.ADDED_TO_STAGE, this.init);
            }
        }
        
        private function init(e:Event = null):void {
            super.removeEventListener(Event.ADDED_TO_STAGE, this.init);
            this.classNormal = new Normal();
            this.classHover = new Hover();
            
            this.normal.addChild(this.classNormal);
            this.normal.addEventListener(MouseEvent.ROLL_OVER, this.onRollOver);
            this.normal.addEventListener(MouseEvent.ROLL_OUT, this.onRollOut);
            
            this.hover.addChild(this.classHover);
            this.hover.visible = false;
            
            super.addChild(this.hover);
            super.addChild(this.normal);
        }
        
        private function onRollOver(e:MouseEvent):void {
            Mouse.cursor = MouseCursor.BUTTON;
            this.hover.visible = true;
        }
        
        private function onRollOut(e:MouseEvent):void {
            Mouse.cursor = MouseCursor.ARROW;
            this.hover.visible = false;
        }
    }
}