code: private void onDashboardDeletedEvent(@Observes DashboardDeletedEvent event) {
          NavTree navTree = navigationManager.getNavTree();
          navTree.deleteItem(event.getDashboardId());
          navBar.show(NavTreeDefinitions.GROUP_APP);
          workbenchNotification.fire(new NotificationEvent(constants.notification_dashboard_deleted(event.getDashboardName()), INFO));
      }
docs: Event coming from old dashboards (created with versions prior to 0.7)