[Mono-dev] How to step into mono codes?

[morteza adi]

I cloned the mono codes and build the code in my pc.
In monodevelope I unchecked the "do not step into mono code" however it
doesn't work. I dont known where to put my mono codes for IDE
I use ubuntu 14.04 and I tried /usr/..src
Also /build/buildd with no success!
How can I step into mono?
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