"Mouse Wheel" redirigir a un fotograma

[Manuellama]

import flash.events.MouseEvent;
this.stop();
function handleMouseWheel(event:MouseEvent):void {

if (event.delta>0){
trace(event.delta);
this.gotoAndPlay(this.currentFrame+1);
}else{
trace(event.delta);
this.gotoAndPlay(this.currentFrame-1);
}
trace(this.currentFrame);
}
stage.addEventListener(MouseEvent.MOUSE_WHEEL, handleMouseWheel);