How Do You Change the Pose in a Pose Ball?

Okay, I know I've done this before but I can't remember how. I was using a Sit pose ball and I had read a tip that by pressing a certain button (I think it was one of the f buttons), you could alter the pose somewhat (I.E. if they were sitting with their legs crosses, you'd press the button and they'd change to leaning on their hand while still sitting). I can't seem to find any mention of it anywhere. Does anyone know what this key could be?

I think it depends on how many and what animations are loaded into the pose ball itself.

Yeah that's not something that just generally works for all poseballs, the one you ran across specially scripted to do that.

ANTI!!!!!

Erm, anyway, I have a little sofa from Relic which does that when you press Page Up or Down. It's sort of amusing to watch your av flop around like a fish. lol