Away 3D question (not AwayBuilder yet)

Question

Hi.  I am trying to instantiate a simple Sphere with a Class called SphereDemo.as .
Here is the code for that class:
package
    import away3d.Away3D;
    import away3d.primitives.SphereGeometry;
    public class SphereDemo extends Away3D
        public function SphereDemo()
            super();
        public function initScene(stage:Object):void
            //super.init();
            var sphere:SphereGeometry = new SphereGeometry(50,15,12,true);
            var obj:Object = new Object();
            obj.x=0;
            obj.y=0;
            obj.z=500;
            //sphere=new SphereGeometry(obj);
            stage.addChild(sphere);
and here is my code for the mxml document:
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
                       xmlns:s="library://ns.adobe.com/flex/spark"
                       xmlns:mx="library://ns.adobe.com/flex/mx"
                       creationComplete="init();">
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            //import SphereDemo;
            public function init():void{
                SphereDemo;
        ]]>
    </fx:Script>
</s:WindowedApplication>
Why won't the SphereDemo display a sphere?  How can I position the Sphere so it shows up in the camera.  My initial belief is since I'm not getting any errors the sphere is behind the camera at the present.

Answer 1

when I follow the instructions on this page...
http://www.adobe.com/devnet/flashplayer/articles/creating-games-away3d.html
I still can't get anything to load and I am sure I have my assets properly placed.  I am using a file called PolarBear.awd as a 3D object.