Mouse events in FastTableModel subclass [Spec]

Hi, I've created a PictureListModel class to manage a list of pictures. It's a subclass FastTableModel and its adapter (MorphicPictureListAdapter) is a subclass of MorphicFastTableAdapter. The widget works correctly: it shows a scrollable list of pictures. The problem is that it cannot handle “click” and “double clicks” events, i.e. double clicking on a list item does nothing, even setting "handlesDoubleClick:" to true. I've tried to figure out the mechanism, looking into the FastTableModel, its Morphic adapter and reading the "BuildingUIWithSpec" doc, but I didn't get it. Where could I find some hint to manage "click" and "double click" events in FastTableModel? Thanks, Matteo