I am running through the "Spec UI Framework" tutorial, and in it has a widget class inherited from "ComposablePresenter" (ComposablePresenter subclass: #WidgetClassList). But for some reason the "whenSelectedItemChanged:" method call does not execute when I select any item on the GUI list. Is there anything I'm missing?

I posted this earlier on the list, and someone suggested I try  "whenActivatedDo:" or "whenSelectionChangedDo:", but it doesn't do anything as well. The code looks like this:

whenSelectedItemChanged: aBlock
    Transcript show: 'should get here; cr.