NSOutlineView "sliding" animation

FROM : Mitchell Livingston
DATE : Wed Mar 26 04:16:58 2008

Hello,

I want to use core animation to add a sliding effect when expanding/
collapsing rows in an outline view (like iChat's groups), but I can't 
figure out where to get started. I have tried using nsview's animator, 
but it doesn't seem to be compatible with this type of animation. 
Could someone point me in the right direction (perhaps a relevant 
tutorial, because my attempts at finding one have failed)?

Thank you,
Mitchell Livingston