Link a symbol with package name to AS3 class in Flash CS5

I have some Flash animations that I need to interact with in Flex. The first step is to create a class that I can then consume in my Flex application.

The problem is that the only way I can get the symbol to link to the class is if I stuff the .as file in the same folder as the FLA. Is there a way I can link to the class in a different folder?

I have tried using the integration with Flex, which correctly creates the class in the package I request, but Flash CS5 never links the cla开发者_StackOverflowss to the symbol.

Have you tried adding the source folder to the classpath in the Flash IDE publish settings?