Mover objeto - ActionScript 3

 1 package  {
 2  
 3  import flash.display.MovieClip;
 4  
 5  
 6  public class main extends MovieClip {
 7   
 8   public var pelota1:pelota;
 9   
10   public function main() {
11    pelota1=new pelota();
12    pelota1.cambioXY();
13    //pelota1.escuchador();
14    
15    addChild(pelota1);
16    pelota1.escuchador2();
17   }
18  }
19  
20 }

 1 package  {
 2  
 3  import flash.display.MovieClip;
 4  import flash.events.*;
 5  import flash.ui.*;
 6  
 7  
 8  public class pelota extends MovieClip {
 9   
10   
11   public function pelota(){
12    x=100;
13    y=100;
14    trace("hola soy la pelota");
15   }
16   
17   public function cambioXY(){
18    x=300;
19    y=300;
20   }
21   
22   public function mensaje(b:Event){
23    trace("hola");
24   }
25   
26   public function escuchador(){
27   addEventListener(Event.ENTER_FRAME,mensaje);
28   }
29   
30   
31   public function mover(e:KeyboardEvent){
32    
33    //trace("mover");
34    switch(e.keyCode){
35   case 37:
36         x=x-2;
37   trace("hola1");
38   if (e.keyCode==38){
39   trace("hola2"); 
40   y=y-2;
41   x=x-2;  
42   }
43    break;
44   case 38:
45    y=y-2;
46    break;
47   case 39:
48    x=x+2;
49    break;
50   case 40:
51    y=y+2;
52    break;
53     }
54      /*if(e.keyCode == Keyboard.){
55   trace("hola"); 
56   y=y-2;
57   x=x-2;  
58   }*/
59   }
60   
61   public function escuchador2(){
62   stage.addEventListener(KeyboardEvent.KEY_DOWN,mover);
63   }
64   
65   
66  }
67  
68 }