Saving a Selection

I am looking to try to save out selected Materials from a Scene.  I can easily do this via the File Menu, Save Selection.  But I haven't had luck finding out how to script via Python.  I was able to find these two threads:

http://forums.autodesk.com/t5/motionbuilder-python/save-selection/m-p/4225533/highlight/true#M2164

http://forums.autodesk.com/t5/motionbuilder-python/save-selection/td-p/4017213?_ga=1.189871467.1353678788.1454539476

However, FBFbxManager seems deprecated.  I realize FBApplication should be used in its place, but there doesn't seem to be a SaveBegin and SaveEnd methods to utilize in this situation.  

Can someone point me in the right direction on how to Save a specific Selection?