FormAPI: trying to register an event

System

Does anyone know why the following piece of code doesn't work? The before-alertbox is popped up, the after one isn't. So clearly the FormAPI in between is not correct. Although it comes straight from the examples provided by interwoven.

alert("before");
IWEventRegistry.addHandler("onSaveDone", saveDone);
alert("after");

I also tried with other events (onSaveValid etc)