If you're using code-behind in your AIR apps, there's a little gotcha you should watch out for: Flex Builder doesn't like it if you include your code behind class in the root package.

For example, if your main MXML file is Main.mxml and your code-behind class is MainClass.as, Flex Builder gets confused and thinks that there should be two application configuration files (one for the MXML file and one for the AS file.) If your app.xml file is named Main-app.xml, you'll get an error along the lines of Adobe AIR application is missing the corresponding MainClass-app.xml.

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I just updated The GAE SWF Project to add the proof-of-concept Google App Engine Flex 3 client. The source code download now includes the source code for the Flex project.

The Flex client works exactly like the Flash 9 client and shares an almost identical codebase. 99% of the framework is the same.

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