Re: best practice for callbacks

MyClassWidget widget = (MyClassWidget) event.getSource();

If all the widgets are different, and your not sure of the type, I'll stick the handler after init of the widget.

for (int i=0; i < 10; i++) {

  MyClassWidget widget = new MyClassWidget();

  widget.addChangeHandler(new ChangeHandler() {

      public void onChange(ChangeEvent event) {

        MapIcon mi = (MapIcon) event.getSource();

        int e = mi.getChangeEvent();

        if (e == AppEventManager.MAPICONSELECTED) {

          setMapIconDataSelected(mi.getMapIconSelected());

        }

      }

    });

}

Not sure that was what your aiming for.

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