Working with AS3 External Classes

Question

Ok... trying to work with AS3 external classes. I have a movieClip that I want to also function as a button. Instance name is "_onDemand". This movieClip is on the stage of my Home.fla.  "_onDemand" movieClip properties   Class:HomePage  Base clase: flash.display.MovieClip
I want the user to click this movieClip and take the user to an external URL within a new browser window or tab.
Can anyone help me? Or at least point me to a really really good tutroial that does exactly this using external classes?
Thanks so much,
Mark
My code:
package com.cox4college.pages
import com.gaiaframework.templates.AbstractPage;
import com.gaiaframework.events.*;
import com.gaiaframework.debug.*;
import com.gaiaframework.api.*;
import flash.display.*;
import flash.events.*;
import com.greensock.TweenMax;
import flash.net.URLRequest;
import flash.net.navigateToURL;
public class HomePage extends AbstractPage
public function HomePage()
super();
alpha = 0;
//new Scaffold(this);
override public function transitionIn():void
super.transitionIn();
TweenMax.to(this, 0.3, {alpha:1, onComplete:transitionInComplete});
override public function transitionOut():void
super.transitionOut();
TweenMax.to(this, 0.3, {alpha:0, onComplete:transitionOutComplete});
public class _onDemand extends Sprite
// Link Navigation button handlers
public var _onDemand:Sprite;
// if you want a hand cursor
_onDemand.buttonMode = true;
_onDemand.useHandCursor = true;
_onDemand.addEventListener(MouseEvent.CLICK, onDemandClickHandler);
_onDemand.addEventListener(MouseEvent.ROLL_OVER, onDemandRollOverHandler);
_onDemand.addEventListener(MouseEvent.ROLL_OUT, onDemandRollOutHandler);
public function onDemandClickHandler(e:MouseEvent):void{
navigateToURL(new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/ondemand.cox"));
public function onDemandRollOverHandler(event:MouseEvent):void{
_onDemand.gotoAndStop("hover");
public function onDemandRollOutHandler(event:MouseEvent):void{
_onDemand.gotoAndStop("static");
Getting the following errors:
1120: Access of undefined property _onDemand.

Answer 1

Ok. I admit it... I had some wonderful help to resolve this issue. You ever feel like you are on an island learning AS3 External Classes? I feel that way all the time... so far... I plan on not feeling that way soon. I hope this helps someone get off that island.
package com.domainname.client {
    import flash.display.*;
    import flash.events.*;
    import flash.net.*;
    import flash.utils.*;   
    import caurina.transitions.Tweener;
    import caurina.transitions.properties.*;
    FilterShortcuts.init();   
    ColorShortcuts.init();      
    public class Main extends MovieClip {
        private var coverDelay:Number = 4;
        //#DF6D27
        public function Main():void {
            initMain();
        private function initMain():void {
            mc_form.visible = false;
            Tweener.addTween(mc_cover,{alpha:1,time:1,delay:coverDelay,onComplete:formIn});
            btn_onDemand.buttonMode = true;
            btn_listings.buttonMode = true;
            btn_ppv.buttonMode = true;
            btn_rhapsody.buttonMode = true;
            btn_onDemand.addEventListener(MouseEvent.MOUSE_OVER,navOver);
            btn_onDemand.addEventListener(MouseEvent.MOUSE_OUT,navOut);
            btn_onDemand.addEventListener(MouseEvent.CLICK,navClick);
            btn_listings.addEventListener(MouseEvent.MOUSE_OVER,navOver);
            btn_listings.addEventListener(MouseEvent.MOUSE_OUT,navOut);
            btn_listings.addEventListener(MouseEvent.CLICK,navClick);
            btn_ppv.addEventListener(MouseEvent.MOUSE_OVER,navOver);
            btn_ppv.addEventListener(MouseEvent.MOUSE_OUT,navOut);
            btn_ppv.addEventListener(MouseEvent.CLICK,navClick);
            btn_rhapsody.addEventListener(MouseEvent.MOUSE_OVER,navOver);
            btn_rhapsody.addEventListener(MouseEvent.MOUSE_OUT,navOut);
            btn_rhapsody.addEventListener(MouseEvent.CLICK,navClick);           
            function navOver(evt:MouseEvent):void {
                Tweener.addTween(evt.target,{_color:0xffc614,time:.2});
            function navOut(evt:MouseEvent):void {
                Tweener.addTween(evt.target,{_color:0xffffff,time:.2});
            function navClick(evt:MouseEvent):void {
                var url;
                switch (evt.target.name) {
                    case 'btn_onDemand':
                    url = new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/ondemand.cox");
                    break;
                    case 'btn_listings':
                    url = new URLRequest("http://ww2.cox.com/myconnection/santabarbara/watch/entertainment/tv-listings.cox");
                    break;
                    case 'btn_ppv':
                    url = new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/pay-per-view.cox");
                    break;
                    case 'btn_rhapsody':
                    url = new URLRequest("http://ww2.cox.com/myconnection/santabarbara/listen.cox");
                    break;                                                           
                navigateToURL(url,"_blank");