Re: keyframing polygon tool

Well what I have is a cube with 10 segments x,y, z - I make the cube editable, then select a small portion on the front face of the cube, then when I grab the Poly tool, I can extrude that portion of the cube left or right. But I want that to happen over, say 90 frames. I tried pressing the Record PLA / Active Objects at 0, advancing to frame 90 and using the tool to move some stuff, then pressing th Record button again. But that isn;t the trick, obviously.
So can you tell me the correct steps? Must be missing something. Basically, I would like to "shear off" the front face of a cube over time.
Thanks much.
Dennis