Adding parameter from a custom class to an array

1

I Asked a similar question yesterday however I am apparently still confused. Help would be appreciated.

In class Main I am instantiating a custom class NavLabel that creates a textField. With in NavLabel I dispatch a custom event CustomEventWithParams on a reference to class Main that passes the parameter theLabelWidth along with it. from with in class Main i can trace the
theLabelWidth for each of the instantiated NavLabel objects. I want to hold those values in an array labelWidthArray and then use them to position the NavLabel objects. how can I do this?

Thanks,

class Main


package 
{    
    import flash.display.*;
    import flash.events.*;

    public class Main extends MovieClip{
        private var label1:NavLable;
        private var label2:NavLable;
        public var labelWidthArray:Array;
        
        public function Main()
        {    
        addEventListener(CustomEventWithParams.LABEL_WIDTH, widthFromParam);
        init();
         }

        function init(){
            label1 = new NavLable(this,"label1Text");
            label2 = new NavLable(this,"label2");
            }
            
        function widthFromParam(e:CustomEventWithParams):void{
        trace(e.params.param);// this traces "55" "88"
        labelWidthArray.push(e.params.param); //Cannot access a property or method of a null object reference.




        }

class NavLabel


package  {
    import com.greensock.loading.*;
    import com.greensock.events.*;
    import flash.display.*;
    import flash.text.*;
    import CustomEventWithParams;
    
    public class NavLabel extends Sprite{
        private var theLabel:TextField;
        private var _theText:String;
        private var txtFmt:TextFormat;
        private var loader:SWFLoader;
        public var theLabelWidth:int;
        public var main:Main;
        
        public function NavLabel(main,theText:String) {
        _theText = theText;
        this.main = main
        loader = new SWFLoader("fonts/fonts.swf", {onComplete:completeHandler});
        loader.load();
        }
        
    function completeHandler(event:LoaderEvent):void {
        var fontClass:Class = loader.getClass("TheCantarell");
        Font.registerFont(fontClass);

            txtFmt= new TextFormat();
            txtFmt.font = "Cantarell";
            txtFmt.bold = true;
            txtFmt.size = 15;
            
            theLabel = new TextField();
            theLabel.mouseEnabled = false;
            theLabel.text = _theText;
            theLabel.setTextFormat(txtFmt);
            theLabel.autoSize = TextFieldAutoSize.LEFT;
            theLabel.border = true;
            theLabelWidth = theLabel.width;
            
            var evt:CustomEventWithParams = new CustomEventWithParams(CustomEventWithParams.LABEL_WIDTH, {param:theLabelWidth});
            main.dispatchEvent(evt);
            this.addChild(theLabel);
            }
        
        public function get getLabelWidth():String {
        return  _theText
        }
        
    }
    
}

CustomEvent Class


package 
{
    import flash.events.Event;
   
    public class CustomEventWithParams extends Event{
    
        public static const LABEL_WIDTH:String = "LabelWidth";
       
        public var params:Object;
       
        public function CustomEventWithParams(type:String, params:Object, bubbles:Boolean = false, cancelable:Boolean = false)
        {
            super(type, bubbles, cancelable);
           
            this.params = params;
        }
   
        public override function clone():Event
        {
            return new CustomEventWithParams(type, this.params, bubbles, cancelable);
        }
       
        public override function toString():String
        {
            return formatToString("CustomEventWithParams", "params", "type", "bubbles", "cancelable");
        }
   
    }
}