I know.. I know, it's only a few hours old.

But how the hell do you get the little page tabbing/cycle (forgot what the official name is) on the top of the page under the app title.

MIX Keynotes made it look like it was a control (or at least what I saw, was @ work).

Anyone who made MIX or knows how they are doing this, it'd be cool to get an answer.

Thanks!