Circle Packing, take render or screenshot via vb.net code

Hi everybody.

I've managed to make an easy implementation of a circle packing algorithm.

If you have some advice to give me please im glad to hear you.

I've a question for you.

If you see in my vb.net code im taking a viewport screenshot every iteration.
I'm trying to take a screenshot every 60 ms. I've try using System.timer but with no success because when i call doc.Objects.addCircle(...) it give me an error about calling a non shared member etc..

Which is the way to accomplish that ? thanks

Can i have some example?

Sorry for english