In order to start playing with the code in gumbo, you need to get the source for the framework from the Adobe Open Source Website. From there you can add it as an available Flex SDK in Flex Builder and start to play with the code.

Mike Chambers has a good blog post on how to set this up, but I have also prepared a screencast to show you how to set this up.

Full Size Video Here

The final code for this demo looks like this.

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< ?xml version="1.0" encoding="utf-8"?>
<application xmlns="http://ns.adobe.com/mxml/2009" xmlns:mx="library:adobe/flex/halo" >
	<mx :Button label="Halo Button" />
	<button label="Gumbo Button" />
</application>

Note. The Application and Button tags above should be upper case, but every time I save wordpress lowercases them. Show Just know that < Application /> and < Button /> are references to classes.