[ns] problem occuring when adding a new TCP agent

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I wrote a sub-agent of TCP, that means I put new files TCP-xxx.h, TCP-xxx.cc in 
the folder of TCP, and modified tcp.h, tcp-sink.h and tcp-sink.cc. Then add 
TCP_xxx.o to OBJ_CC in makefile.in, and then do "make"
i try to use the agent with "New Agent/TCP/xxx", but it seems un-recognizable.
what's possibly the problem? 
pls give me some ideas, thx a lot
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