[flexcoders] Extending Custom Panel with RadioButtons - Help

[Wally Kolcz]

                                Using an example from the web I am trying to 
create a custom Panel component that had radio buttons in the panel header for 
a specific piece of a web site. The panel works and I am getting 2 radio 
buttons but no labels for either button and the radioGroup's 
                                changeStartType() is not being called
                                . What am I doing wrong? Here is the AS:

package com.wallykolcz.views.components
{

    import edu.umich.body.Maps;
    import flash.events.Event;
    import mx.containers.Panel;
    import mx.controls.Button;
    import mx.controls.RadioButton;
    import mx.controls.RadioButtonGroup;

    public class RadioButtonPanel extends Panel
    {

        //Create Radio Button Group and Buttons
        private var startLocation:RadioButtonGroup = new RadioButtonGroup();
        private var addressRB:RadioButton = new RadioButton();
        private var airportRB:RadioButton = new RadioButton();
        private var maps:Maps;

        //constructor
        public function RadioButtonPanel()
        {
            super();
        }

        public function changeStartType():void {
            if (startLocation.selectedValue == "address"){
                maps.start_txt.text = "Enter Starting Address";
                maps.frmAirport.includeInLayout = false;
                maps.frmAirport.visible = false;
                maps.frmAddress.includeInLayout = true;
                maps.frmAddress.visible = true;
                maps.submit_btn.visible = true;
            }else{
                maps.start_txt.text = "Choose Your Airport";
                maps.frmAddress.includeInLayout = false;
                maps.frmAddress.visible = false;
                maps.frmAirport.includeInLayout = true;
                maps.frmAirport.visible = true;
                maps.submit_btn.visible = true;
            }
        }

        protected override function createChildren():void{
            super.createChildren();
            //instantiate new radiobuttons and assign properties
            addressRB.value="address";
            addressRB.label="My Address";
            addressRB.groupName = "startLocation"; 

            airportRB.value="airport";
            airportRB.label="Airport";
            airportRB.groupName="startLocation"

            //add event listener for change event and call method
            startLocation.addEventListener(Event.CHANGE, changeStartType);

            //add the buttons to rawChildren
            rawChildren.addChild(addressRB);
            rawChildren.addChild(airportRB);
        }

        protected override function updateDisplayList(unscaledWidth:Number, 
unscaledHeight:Number):void{
            super.updateDisplayList(unscaledWidth, unscaledHeight);
            //gap between label and edges of button
            var margin:int = 4;

            //position the buttons in the panel
            addressRB.move(145, 15);
            airportRB.move(255,15)
        }