Dynamically add Canvas not working

Question

I have extended the Canvas class and i am trying to add it dynamically  to the stage, unfortunately it is not showing up.
code from extended Canvas class;
package com
import mx.containers.Canvas;
public class CustomCanvas extends Canvas
public function CustomCanvas()
super();
protected override function updateDisplayList(unscaledWidth:Number,  unscaledHeight:Number):void
super.updateDisplayList(unscaledWidth, unscaledHeight);
super.setStyle("borderStyle","solid");
super.setStyle("cornerRadius",10);
super.setStyle("backgroundColor","#FFFFFF");
Here is the Flex code that is being used to initiate the Canvas;
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute"
cornerRadius="20"     
creationComplete="init()" xmlns:com="com.*">
<mx:Script>
<![CDATA[
import mx.flash.UIMovieClip;
import mx.core.UIComponent;
import mx.containers.Canvas;
import com.CustomCanvas;          
public function init():void
var myCanvas:CustomCanvas = new CustomCanvas();
addChild(myCanvas);
myCanvas.x = 600;
myCanvas.y = 200;
myCanvas.width = 200;
myCanvas.height = 200;
]]>
</mx:Script>
<com:CustomCanvas
width="200"
height="200"
borderStyle="solid"
cornerRadius="10"
backgroundColor="#FFFFFF">
</com:CustomCanvas>
</mx:Application>
Creating the Custom Canvas class via MXML works fine, but trying to  create it dynamically does not.
Any thoughts ?

Answer 1

i found a way to fix mine that maybe you could try.
Look in your Profile Folder (go to this link to find out how to do that: http://kb.mozillazine.org/Profile_folder_-_Firefox#Finding_the_profile_folder )
Now, delete these files but make sure Firefox isn't running when you do this:
extensions.cache
extensions.ini
extensions.rdf
Restart/open Firefox and they should work now.