MyButton with dynamically loading images

Question

Hello!
I've tried to write my own button based on MovieClip. So I created a new MovieClip called MyButton. It has 3 main frames (or clue frames or... I don't know how it's called in English ): the first is for button's upState, the last two are the start and the end of press animation (I need a long animation - not just one frame). All the frames are empty.
Then I created a class MyButton.as:
package  {
     import flash.display.MovieClip;
     import flash.display.Loader;
     import flash.display.Bitmap;
     import flash.net.URLRequest;
     import flash.display.LoaderInfo;     
     public class MyButton extends MovieClip
          public var upState:Bitmap;
          public var downState:Bitmap;
          public var currState:Bitmap;
          public function MyButton(_upState:Bitmap, _downState:Bitmap)
               upState = _upState;
               downState = _downState;
               currState = upState;
               gotoAndStop(1);
               addChild(currState);
          public function pressed()
               gotoAndStop(2);
               removeChild(currState);
               currState = downState;
               addChild(currState);
               play();
          public function unpressed()
               gotoAndStop(1);
               removeChild(currState);
               currState = upState;
               addChild(currState);
and my main class is:
package my
     public class Main extends MovieClip
          var button_up:Loader = new Loader();
          var button_down:Loader = new Loader();
          var up : Boolean = false;
          var down : Boolean = false;
          var btn : MyButton;
          public function Main()
               button_up.contentLoaderInfo.addEventListener(Event.COMPLETE, compUp);
               button_up.load(new URLRequest("C:\\images\\back_up.png"));
               button_down.contentLoaderInfo.addEventListener(Event.COMPLETE, compDown);
               button_down.load(new URLRequest("C:\\images\\back_down.png"));
          function compUp(event:Event)
               up = true;
               if (up && down)
                    btn = new MyButton(Bitmap(button_up.content), Bitmap(button_down.content));
                    addChild(btn);
                    btn.addEventListener(MouseEvent.CLICK, my);
          function compDown(event:Event)
               down = true;
               if (up && down)
                    btn = new MyButton(Bitmap(button_up.content), Bitmap(button_down.content));
                    addChild(btn);
                    btn.addEventListener(MouseEvent.CLICK, my);
          function my(event:MouseEvent)
               btn.pressed();
And the last main frame of MyButton timeline has: unpressed();
It all works as I want, but I know, that it's a bad solution... especially calling unpressed() from the frame... So maybe someone could give me some advice about writing my own button class?
PS and I'm sorry for my Endlish =)

Answer 1

OK, I got it, thanks )
But for now I'm afraid I have no time to learn it... but I really got it, I think )
That's what I get for now:
package  {
     import flash.display.MovieClip;
    import flash.display.Loader;
    import flash.display.Bitmap;
    import flash.net.URLRequest;
    import flash.display.LoaderInfo;    
    import flash.events.MouseEvent;
    import flash.events.Event;
    public class MyButton extends MovieClip
         public var upStatePath:String;
        public var downStatePath:String;
     public var l:Loader = new Loader();
     var b:Boolean;
        public function MyButton(_upState:String, _downState:String)
          upStatePath = _upState;
          downStatePath = _downState;
          unpressed();
          addEventListener(MouseEvent.CLICK, pressed);
          addFrameScript(totalFrames-1, unpressed)
        public function pressed(event:MouseEvent = null)
          b = true;
          l.contentLoaderInfo.addEventListener(Event.COMPLETE, showPic);
             l.load(new URLRequest(downStatePath));
        public function unpressed()
          b = false;
          l.contentLoaderInfo.addEventListener(Event.COMPLETE, showPic);
                l.load(new URLRequest(upStatePath));
                gotoAndStop(1);
     function showPic(event:Event)
          try {
               removeChildAt(0);
          catch(e:Error) {}
          addChild(Bitmap(l.content));
          if (b) play();
It works as I want, no code in the frames, quite independent I guess ))
That's enough for me for now )
Thanks for help!