HELP! Scrolling a long tube of buttons

I’ve been looking around for tutes on scrolling objects using actionscript; I haven’t been lucky, most are tweens which I don’t what to do.

I’ve got a mask, and a long tube of buttons in a movie clip. I’m trying to programatically scroll that tube under the mask, but in a circular fashion, ie, when the end of tube appears, immediately after it is the front of the tube.

I did get a kind of scrolling action using the following on the tube clip …

_x = _x + 5;

…however I can’t get that circular scrolling action. Any hints? Or is this one consigned to the tweenage?