Noob OOP help - button functions not working between two different as files

Hey… im kinda new to As3… (Did some as2 before)
anyway… Starting the OOP way of learning as3.
The question:

I cannot understand how i get a function in one AS file to interact with another AS file in the same (folder). I understand that the siblings of one parent does not talk together. They each talk to the parent but not eachother!?(or?)

Here is the deal :

1:the
[CENTER]"“KnapperBakgrunn.as”"[/CENTER] file is the parent of:

[CENTER]“skyer.as” and “Knapper.as”[/CENTER]

I need the Knapper.as to be able to send commands to the skyer.as. I think its called scoping(not sure) but i dont know where or how to put it in the code.

Here is the code for KnapperBakgrunn.as


package 
{
	import flash.events.MouseEvent;
	import flash.display.MovieClip;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	
	import bakgrunn;
	import Knapper;
	import skyer;
	import bgImage;
	
	
	public class knapperBakgrunn extends MovieClip
	{
		private var numberOfButtons:int = 5;
		private var offsetX:int = (stage.stageWidth) /numberOfButtons;
		private var offsetY:int = 50;
		private var padding:int = 25;
		public var clouds:skyer;
		public var button:Knapper;
		

		
		public function knapperBakgrunn()
		{
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			
			//Bakgrunns bilde
			var bgI:bgImage = new bgImage();
			addChild(bgI);
			setChildIndex(bgI, 0);
			
			//Skyer 1
			var clouds:skyer = new skyer();
			addChild(clouds);
			trace(clouds.x)
			
			
			//Bakgrunnbanner
			var bg:bakgrunn = new bakgrunn();
			addChild(bg);	
			
			for (var i:int=0; i<numberOfButtons; i++)
			{
				var button:Knapper = new Knapper("knapp" + (i+1));
				button.x = offsetX;
				button.y = offsetY;
				button.addEventListener(MouseEvent.CLICK, onButtonClicked);
				addChild(button);
				offsetX += button.width + padding;
			}		
		}
		
		private function onButtonClicked(e:MouseEvent=null):void 
		{
			var button:Knapper = e.target as Knapper;
			trace("onButtonClicked: " + button.getLabel());
		}
	}
}

The Code for Knapper.as


package {
	import flash.events.MouseEvent;
	import flash.display.MovieClip;
	import flash.text.TextField;
	import caurina.transitions.Tweener;
	import skyer;
	
	
	public class Knapper extends MovieClip {
		
		public var label:TextField;
		
		public function Knapper(l:String="Default") {
			label.text = l;
			buttonMode = true;
			mouseChildren = false;
			addEventListener(MouseEvent.ROLL_OVER, onRollOver);
			addEventListener(MouseEvent.ROLL_OUT, onRollOut);
			addEventListener(MouseEvent.MOUSE_DOWN, onMouseDown);
			addEventListener(MouseEvent.MOUSE_UP, onMouseUp);
		}
		
		
		public function setLabel(l:String="Default"):void {
			label.text = l;
		}
		
		
		public function getLabel():String {
			return label.text;
		}
		
		public function onRollOver(e:MouseEvent=null):void {
			
			alpha = 0.75;
		}
		
		public function onRollOut(e:MouseEvent=null):void {
			alpha = 1;	
		}
		
		public function onMouseDown(e:MouseEvent=null):void {
			Tweener.addTween(skyer2,{x:200, time:2});
			alpha = 0.5;
		}
		
		public function onMouseUp(e:MouseEvent=null):void {
			alpha = 0.75;
		}
		
	}
}

And the code for skyer.as


package 
{
	import flash.events.Event;
	import flash.display.MovieClip;
	import flash.text.TextField;
	import flash.events.MouseEvent;
	import caurina.transitions.Tweener;
	import Knapper;
	
	
	public class skyer extends MovieClip 
	{
		
		public function skyer()
		{
			
			//Skyer 2
			var clouds2:skyer2 = new skyer2();
			//clouds2.x = 0;
			addChild(clouds2);
			
			//Skyer 3
			var clouds3:skyer3 = new skyer3();
			addChild(clouds3);
			
			//Skyer 4
			var clouds4:skyer4 = new skyer4();
			addChild(clouds4);
			
			//Skyer 5
			var clouds5:skyer5 = new skyer5();
			addChild(clouds5);
			
			//Skyer 6
			var clouds6:skyer6 = new skyer6();
			addChild(clouds6);
		}
				
		
		private function onAddedToStage(e:Event=null):void
	}
}

I hope i described it correctly. Thanks for any help. ill provide all the information i can on this.