Will and David,
This was only a limitation in the Beta version. Do you have any errors listed in the problems window?
-locale en_US -source-path=locale/{locale} -keep-all-type-selectors=true
Adobe tooling support for Apache Flex
Flash Builder
Development of Flash Builder continues. Adobe plans to maintain support for Flex projects in updates to Flash Builder 4.x, including additional work to ensure Apache Flex based SDKs can work within Flash Builder. Adobe will evaluate integrating an Apache-derived Falcon MXML compiler into Flash Builder if and when a suitable compiler is available from the open-source project. In order to better support future Apache-derived Flex SDKs, Design View, Data Centric Development tools, and Flash Catalyst workflows will be removed in updated 4.x versions of Flash Builder.