ADOxx provides a set of event handlers that are invoked from ADOxx in various user interaction. Please note that those events are invoked on meta-meta model level, so sometimes they seem a bit odd when only having the application in mind. (e.g. listing on attribute changes of objects may result in several events, although on application level the event seems much simpler)
For an overview on events available, please have a look at the online help in the Development tookit (press F1 with the Development tookit in focus)
A sample implementation can be downloaded in Solution Sample 2b V2: DOWNLOAD