Flex mobile app attach complex AS3 movieclip SWC

I have a Flex mobile project and I want to place a complex movieclip on the stage that has its own classes and exported from Flash CS5.5 as a SWC.
OK no worries there but as soon as I have addChild called in the Flash movieclip/SWC.. Flex errors and cannot access null object reference.
I also went down the Flex Component Kit though then I can't seem to access the classes??
Any thoughts or suggestions appreciated.

Did you ever find a solution?

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