Resizing Extension Panel does not layout Flex controls at all, simply scales stage

Question

Hello,
I'm having this issue with Extension Panels in Fireworks compiled with the Flex 4 SDK. When the panel is first opened, it has the correct dimensions and controls are laid out correctly. If I resize it at all, it scales itself instead of laying out it's controls to take advantage of the new space. This doesn't seem to occur when using Flex 3's mx:Application, only Flex 4. Any ideas?
Before Resize:
After Resize:
This occurs no matter the Application container control I use - mx:Application, mx:ApplicationWindow, cs:CSXSWindowedApplication, and so on.
My Application MXML is as follows:
<?xml version="1.0" encoding="utf-8"?>
<cs:CSXSWindowedApplication
  xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
  xmlns:cs="com.adobe.csxs.core.*" xmlns:s="library://ns.adobe.com/flex/spark"
  <!-- Setting width & height are the only way I can get it to show properly when first opened. -->
  width="200" height="200" historyManagementEnabled="false" showStatusBar="false">
  <s:Button label="Click Me" />
</cs:CSXSWindowedApplication>

Answer 1

So they key is apparently to have this as a compiler flag:
-includes=mx.managers.systemClasses.MarshallingSupport
And in applicationComplete:
CSInterface.instance.autoThemeColorChange = true;
Also use CSExtension as your base application class/component.