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Flex 3.4 SDK Error – focusInHandler

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at mx.managers::FocusManager/focusInHandler [no source]

This is definitely an SDK bug. I was using the Flex 3.5 SDK and then downgraded to 3.4.1.10084. That is when this error magically appeared. Switched back to 3.5, all better.