Window.alert("You clicked tab " + event.getSelectedItem());
}
});
// Just for fun, let's disallow selection of 'bar'.
bar.addBeforeSelectionHandler(new BeforeSelectionHandler<Integer>() {
public void onBeforeSelection(BeforeSelectionEvent<Integer> event) {
if (event.getItem().intValue() == 1) {
event.cancel();
}
}