Using mask in Mecanim

Hello, I’m using Mecanim in Unity 4.1.2f1. I want to use a mask for several clips, not for the layer as a whole. I can see that Unity offers such a menu in Editor (see screenShots), but after I made my changes nothing happens. Also, I can’t throughly understand how Body Mask and Transform Mask working together. Does Transform Mask override the Body Mask (I can’t find any documentation on these subject!)? Thanks in advance.

Sorry for the late reply.

Yes, it seems that if you want to set Transform Mask you should first set Body Mask to none (I mean all red). Only after that Transform Mask will be applied. But now I am using Unity 4.2 and I don’t know if it will work on 4.1.x versions.