ZBrushCentral

Can't Hide/Show with Ctrl/Shift Click

hey all- ever hear of this one?

once i create a polygroup for say, a head that’s attached to a body- and i’m left with one group for the head and the other for the body, then i want to hide the body and be left with just the head’s group- i’m supposed to be able to hold ctrl/shift and then just click on the head’s group and the body’s group should just disappear, correct?
well, i get nothing. when i try, literally nothing happens.

i’m on a mac and using zbrush 4. did something change or am i just doing something wrong?