in Flex how do I make a window not resizable?

So I'm trying to open a second window that is meant to be a fixed size window. I've set resizable property to false but that doesn't seem to have any effect.

here's my sample code

Main app

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/开发者_运维技巧2009" 
                       xmlns:s="library://ns.adobe.com/flex/spark" 
                       xmlns:mx="library://ns.adobe.com/flex/mx"
                       height="600"
                       creationComplete="onCreationComplete()">
    <fx:Script>
        <![CDATA[
            import foo.TestWindow;

            protected function onCreationComplete():void
            {
                var window:TestWindow = new TestWindow();
                window.open();
            }

        ]]>
    </fx:Script>
</s:WindowedApplication>

TestWindow

<?xml version="1.0" encoding="utf-8"?>
<s:Window xmlns:fx="http://ns.adobe.com/mxml/2009" 
          xmlns:s="library://ns.adobe.com/flex/spark" 
          xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300"
          resizable="false">

    <s:Label text="this window should not be resizable" />
</s:Window>

When I run this code, my expectation is that TestWindow should not be resizable. however I can resize it without any problem. Am I missing something here?

I am using Flash Builder 4.5 and the root tag is s:WindowedApplication not s:Window as you said; and there is no property named 'resizable'.
While I was looking for a better solution, I just found this. Hope will help you:
http://www.actionscript-flash-guru.com/blog/16-code-for-a-resizable-window-in-as3

Here is a very simple solution:
Go to the src folder of your application and open HalloFlex-app.xml file. This is the app config file and make following adjustments to the maximizable and resizable properties in this file:

<maximizable>false</maximizable>  
<resizable>false</resizable>  

This way your app window will neither be resizable and nor be maximizable. Thanks!

ok i figured it out. You need to also set maximizable property to false as well for this to work...

I'm not sure why that isn't working but you could try to set maxWidth, minWidth, maxHeight, and minHeight.