I followed Michael's instruction and get the error:
Error using mGraphViz (line 137)
An error occurred when trying to run
the layout engine. The system said,
"/bin/bash: mwdot: command not found
(I can see that there is a mwdot executable is inside the /bin/maci64, and have tried copying it to a new folder /bin/bash with no success)
thanks alexander! that is precisely the issue. the reason for that is that mtoc++ is a mere filter for doxygen and is not "aware" of filesystem-spanning content as is the case for distributed class definitions. so, by including the according function declaration (as actually also is valid syntax in matlab for specifying method properties) in the main file, doxygen recognizes the function belongs to that class and everything is nice & sweet!