Importing Flash movie clips into Flex

I’m trying to get a movie clip class from Flash into Flex Builder 3 (movie clip and external .as file). I used the Flex Components Kit for Flash cs3 and exported the swc into Flex, but was unable to instantiate the class because it wasn’t a valid IUI component?

So I took all the class code and moved it into the first frame of my movie clip. This allowed me to instantiate the class fine, but it tells me that all of the functions are null references.

Anyone have any idea how I can access my movie clip’s functions from flex? I’m using sdk 3.3