code: @Override
      protected List<Resource> prepareTreeItems(ResourceHandle resource, List<Resource> items) {
          if (!nodesConfig.getOrderableNodesFilter().accept(resource)) {
              Collections.sort(items, new Comparator<Resource>() {
                  @Override
                  public int compare(Resource r1, Resource r2) {
                      return getSortName(r1).compareTo(getSortName(r2));
                  }
              });
          }
          return items;
      }
docs: sort children of orderable nodes