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Migrating from Flex 1.x to Flex 2 was -- how can I put it -- painful. We scrubbed the APIs to make them consistent; as a result, many properties, methods, events, and even some constants changed, and sometimes changed again. We added and removed classes and interfaces. Heck, we even changed the capitalization of "Void" to "void". In addition, the underlying language went from ActionScript 2.0 to ActionScript 3.0. There was no shortage of tasks for updating apps from 1.x to 2.