please help! an error raised when build a MFC extension dll with managed classes

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Hi guys,

I'm building a MFC extension dll using c++.net 2003. everything was fine before I add the flag AFX_EXT_CLASS to a managed class. but once add this flag, as following:

__gc class AFX_EXT_CLASS A
{
//class def.
}

I got a compile error:
Error C3386:__declspec(dllexport)/__declspec(dllimport) cannot be applied to a manage. But class A has to be a managed class since it has managed variables.

Can somebody help me? Thanks a lot!