A while back, I set out to integrate the NewPrerequisiteEngine add on. That work has now been integrated into the latest build of VisualWorks (7.7 may09.1). It ended up being a bit more than a "file in and include in build." The new engine is faster, but more thorough at the same time. The biggest change, is a complete rewrite of the UI. Here's a movie I put together using Screenflick and iMovie. Sorry for the poor audio transitions with my voice, I didn't give enough lead in time with the individual screencasts. And I have the sniffles because it's allergy season here.

All of the widgets (except the scrollbar) follow the development arc of using no Controller objects, and dynamic layouts supported by Panel objects. And no Wrappers.