private TabPanelContract createDefaultTabPanel(InteractionUnit interactionUnit, EventBus eventBus) {
final TabPanel tabPanel = new TabPanel();
tabPanel.setStyleName("default-tabpanel");
tabPanel.addBeforeSelectionHandler(new NavigationHandler(interactionUnit, childUnits, tabPanel));
/*tabPanel.addAttachHandler(new AttachEvent.Handler() {
@Override
public void onAttachOrDetach(AttachEvent attachEvent) {