on Mac model importer sample

hello I need some help the importer for obj models is not showing up at the importer list or the processor list in the pipeline tool on Mac
it is a direct convert of microsoft modelimportersample from app hub for wavefront obj files
or if anyone hav an importer for working with wavefront obj files direct in monogame with out the content pipeline that is okay

so my game zombies night out from windows phone can get finish iOS,tvos,mac is the only missing platform I am programming on Mac now an the pipeline tool and visual studio will only compile textfonts and sprite texture not any 3d stuff on Mac

tank you
Michael hansen