[flexcoders] Flex Component Kit - trouble with FlexContentHolder

[ben.clinkinbeard]

I have converted my symbol to Flex Conatiner via the commands and then
added the FlexContentHolder to the symbol and gave it an instance name
of contentHolder. I get this error:

Cannot create property contentHolder on...

If I don't give the FlexContentHolder an instance name it is ignored.
What gives?

Thanks,
Ben