protected void initDataSourcesPresenter() {
final ResourceSetAvatarResourceSetsPresenter presenter = new ResourceSetAvatarResourceSetsPresenter(
resourceSetAvatarFactory);
presenter.init();
addWidget(DATA_PANEL, presenter.asWidget());
dataSources.addEventHandler(new ResourceSetAddedEventHandler() {
@Override
public void onResourceSetAdded(ResourceSetAddedEvent e) {
presenter.addResourceSet(e.getResourceSet());
}