First Attempt at AIR, ApplicationControlBar not working

Question

I'm following an example (done in mx namespace) that creates a control bar. All I've done differently is use the s namespace for <s:WindowedApplication> and <s:Button>
Problem is the button doesn't appear at all in the control bar.
<?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">
     <mx:ApplicationControlBar dock="true">
        <s:Button id="go" label="Go" />
     </mx:ApplicationControlBar>
</s:WindowedApplication>
I read somewhere something about contentControlBar, but that seems to be used with the <s:Application> tag and not with <s:WindowedApplication>. This is an AIR example, and I'm using Flash Builder 4 Premium. Any ideas what's going on?
Thanks.

Answer 1

Try this. I tried on FB4 & it works for me.
<?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">
      <mx:ApplicationControlBar dock="true" height="100%" width="100%">
        <s:Button  id="go" label="Go" x="200" y="200" />
     </mx:ApplicationControlBar>
</s:WindowedApplication>