How to call main Class methods

programming flash
1

Hi …

I have one main class to attach MovieClip from library call “Circle” and everything was attach and display to stage smoothly…my problem is how to call a methods from this Main class form Circle MovieClip I mean inside “Circle.as” …u can see my code below
Main.as


package{
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.display.DisplayObjectContainer;
    import flash.display.MovieClip;
    import flash.events.Event;
    
    
    public class Main extends Sprite{
        private var _stage:DisplayObjectContainer;
        
        public function Main(stage_:Stage){
            _stage = stage_;
        }
        
        public function attachCircle():void{
            var circle:Circle = new Circle();
            //circle.x = 100;
            //circle.y = 100;
            _stage.addChild(circle);
            
        }
        
        public function callMe():void{
            trace("foo");
        }

    }//end class    
    
}

Circle.as


package{
    import flash.display.MovieClip;
    import flash.events.Event;
    
    public class Circle extends MovieClip{
        
        public function Circle(){
            this.addEventListener(Event.ENTER_FRAME, moveCircle);
        }
        
        private function moveCircle(e:Event):void{
            var mc:MovieClip = (e.target as MovieClip);
            mc.y = 100;
            if(mc.x < 400){
                mc.x += 10;
            }else{
                mc.removeEventListener(Event.ENTER_FRAME, moveCircle);
                //how to call function in main class here in another words equivalent some sort of  _global function in AS2
                callMe();
//it thrown this error  for my attempt so far ...
                **//1180: Call to a possibly undefined method callMe.**
            }
        }
        
    }
    
    
}

Hope someone can give me some shed on light on it…really need help…tq…