@Override
    public void selectionChanged(@NotNull ContentManagerEvent event) {
      ServiceView serviceView = getServiceView(event.getContent());
      if (serviceView == null) return;

      if (event.getOperation() == ContentManagerEvent.ContentOperation.add) {
        serviceView.onViewSelected();
        updateNavBar(myContentHolder);
      }
      else {
        serviceView.onViewUnselected();
      }
    }
@Override
    public void selectionChanged(@NotNull ContentManagerEvent event)