GWT Showcase Sample App CustomDataGrid FieldUpdate.update doesn't fire "change" event of SelectionCell. Is this a BUG?

Can someone confirm this? 

In the GWT Showcase sample app (I'm using GWT 2.6) the update method of the FieldUpdater for the categoryColumn in CwCustomDataGrid never fires. This is a SelectionCell which should fire "change" events and it never does. I tested it in SuperDev Mode. Development environment = Windows 7, Eclipse, GWT 2.6.0, tested in Chrome, IE and Firefox. I never get the alert (below) when changing the category column selection values. 

categoryColumn.setFieldUpdater(new FieldUpdater<ContactInfo, String>() {

      @Override

      public void update(int index, ContactInfo object, String value) {

    Window.alert("update()!");

        for (Category category : categories) {

          if (category.getDisplayName().equals(value)) {

            object.setCategory(category);

          }

        }

        ContactDatabase.get().refreshDisplays();

      }

    });

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