Radial Masking

Hey guys:

Is there a way through Actionscripting or simple animation to create a smooth radial mask?
I’m not trying to use the gradient effect by any means, I want to achieve an effect that looks like a pie chart filling up from a 1 degrees all the way to 360 degrees.

Can anyone suggest a tutorial on a the web or a way to start this?

Thanks!

A-dawg