[MonoDevelop] Step through debugging in mono

[Quandary]

Hi, question:
Is the Debug-Feature "Step Through (F8)" in mono/MonoDevelop
already implemented in some version?
Because I use the 2.6 stable version of mono/MonoDevelop, compiled
myself from source,
and there, the option is always gray.

I would need that feature about now to debug a mail server...

Is it implemented in the SVN version of mono/MonoDevelop ?
Or is it just gray there, too ?
Or do I need to install an additional component, or configure someting
?

Or is there a way to remote-debug (step trough) an application
that runs on Linux from Visual Studio on Windows ?

I'm not particularly interested in debugging with GDB,
it's not very helpful...