How to remove event listener when all the MoviClip are off the stage

Question

Hi i am newbie to as3,
    I am creating animation using as3 in which i duplicate the circle ten time,then pushing into an array and giving random motion. When all the duplicate object goes outside the stage then i should remove the event listener. But right now when one duplicate object goes off the stage the event listener is removed. Thanks in advance

Answer 1

//---------code for creating random bubble movement------//
var bubbleNo:Number = 10;
var vx:Number = .3;
var vy:Number = .5;
var bubbles:Array = new Array();
var bubbleRadius:Number = 9;
var myColor:ColorTransform = this.transform.colorTransform;
init();
function init():void {
for(var i:Number = 0; i<bubbleNo; i++){
          var bubble = new newBall();
bubble.x = Math.random() * stage.stageWidth;
bubble.y = Math.random() * stage.stageHeight;
//bubble.color = Math.random
//trace("bubble.x=="+bubble.x+"bubble.y=="+bubble.y);
bubbles.push(bubble);
myColor.color = Math.random() * 0xFFFFFF
bubble.transform.colorTransform = myColor;
addChild(bubble);
          addEventListener(Event.ENTER_FRAME,createBubble);
//addEventListener(Event.ENTER_FRAME,createBubble);
function createBubble(event:Event):void{
for(var k:Number = bubbles.length-1; k>0; k--){
          var bubble = (newBall)(bubbles[k]);
          bubble.x += vx;
          bubble.y += vy;
          if(bubble.x - 18 > stage.stageWidth || bubble.x + 18 < 0  || bubble.y - 18 > stage.stageHeight || bubble.y + 18 < 0){
                    removeChild(bubble);
                    bubbles.splice(k, 1);
                    //trace("out"+bubbles.length);
                    if(bubbles.length <= 0 );
                              removeBubble();
                              trace(bubbles.length);
                              //removeEventListener(Event.ENTER_FRAME,createBubble)
                    trace("all Bubbles cleared");
                    function removeBubble():void{
                              removeEventListener(Event.ENTER_FRAME,createBubble)