How to add custom message types in rosmatlab

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Hi everyone,
what do I have to do to add custom message types for use with rosmatlab by TU Darmstadt?

I tried to add a new directory called msg in workspace/src/rosmatlab/rosmatlab and placed a file called Num.msg inside of it. But examining the appropriate CMakeLists.txt file, I noticed all message being included with the function add_mex_messages followed by the message name in paranthesis.

So does anybody know how to solve this?

[Edit 2014-03-12]
Okay I now created a new package outside of the rosmatlab workspace and defined a new message type there. Then I compiled it to make it accessible by the ROS system itself. Then I added a add_mex_messages() statement to the CMakeLists.txt in the rosmatlab workspace and a <build_depend /> tag in the package.xml to refer to that package containing the new message type. When I compiled the rosmatlab workspace with these settings everything went well, until cmake claimed a non-existent header file referred to by the C-MEX file of my message type. In fact the header file doesn't exist at all and I'm wondering why it hasn't been generated by rosmatlab or whatever if everything else has been generated. I'm sorry, if it is obvious to all of you, but it is neither documented nor obvious to me, so if anyone has anything to say about this topic, please let me know! Thanks in advance.

Greets,
Roberto