[F9] for in loop

[mr_malee]

ok after reading a book on OOP Programming i have finally figured it out (well to an extent )

my experiment now works, i have 200 clips moving on stage, hoorah but now i'm just wondering if i should worry about giving these clips their own events or should i do it the old fashion way and run a (for in loop). I originally tried this, but soon realised that my loop was not finding any instances and therefore couldn't control any of them. Has there been changes to the for in loop?

here's my code, hopefully i've done everything right
Class:Main - inherited from an instance on stage

package com.balls {
	
	//flash imports
	import flash.display.Sprite
	import flash.events.*
	//ball class, used to make them balls
	import com.balls.Ball
	
	public class Main extends Sprite {

		public function Main():void{
			var balls:Balls = new Balls()
			addChild(balls)
		}		
	}
	
	class Balls extends Sprite {
		
		//define any variables
		private var ballNum:Number = 200
		
		public function Balls():void{
			//create balls
			for(var i:Number=0;i<ballNum;i++){
				var x:Number = Math.random()*400
				var y:Number = Math.random()*400
				var b:Ball = new Ball(x,y)
				//add event listener to control all balls
				addEventListener(Event.ENTER_FRAME, controlBalls);
				addChild(b)
			}
		}
		
		private function controlBalls(e:Event){
			//loop through all instances
			for(var i:String in this){
				var b:Sprite = this[i]
				b.control()
				trace(b) //traces nothing
			}
		}
	}
}

Class:Ball

package com.balls {
	
	//flash imports
	import flash.display.MovieClip	
	
	public class Ball extends MovieClip {
		
		//make reference to our brain for outside functions
		public var control:Function
		//our inital speeds
		private var vx:Number = Math.random()*2
		private var vy:Number = Math.random()*2
		
		
		public function Ball(x:Number,y:Number):void{
			this.x = x
			this.y = y
			control = moveBall
		}
		
		private function moveBall():void{
			x += vx
			y += vy
		}
	}
}

also, am i referencing the instance correctly in the for in loop: var b:Sprite - and for some weird reason i could use uint, kept returning an error, i wanted to because its faster than Number and only uses positive values

that doesn't work, but if i give each Ball its own event Listener it does. Maybe i could create an array and then loop through that array, but a for in loop should work (at least in flash8)