This day, I've improved the work on buttons : Boxes, Ellipses, Outlines and Polygons objects can be changed in "button objects". It's already possible to add ActionScripts to four button states : press/release/mouse in/mouse out.
It isn't perfect, and the "bitmap buttons" aren't managed.
I hope that ActionScripts and buttons should be finished for first ''0.4" series release in March 2012.
Nevertheless, you'll can play with buttons and Scripts in next release for 0.3 series (31 Jan 2012)