I've put up the 1.0 version of the source code on-line for easy browsing. For the latest version, please go to the download page.
Source:
VisInterface
VisWrapper
VisSimple (bare bones example)
(for the VisSimple example, the ONLY code added to the dialog was for OnOK and OnUser, and a SimpleDataLoader was added to load random waveforms. This is NOT a good app, it has some leaks and isn't a full example, but it does show how easy it is to use VisInterface).