/**
     * Draws {@link COMMENT}s and {@link ATTACHMENT}s.
     * @param ENTRY $obj
     * @param OBJECT_RENDERER_OPTIONS $options
     */
    public function display($obj, $options = null)
    {
        $folder = $obj->parent_folder();
        if ($this->login->is_allowed(Privilege_set_attachment, Privilege_view, $folder)) {
            $attachment_query = $obj->attachment_query();
            if ($attachment_query->size()) {
                ?>
  <h2 id="attachments">
    Attachments
  </h2>
  <div class="grid-content">
  <?php 
                $class_name = $this->app->final_class_name('ATTACHMENT_GRID', 'webcore/gui/attachment_grid.php');
                /** @var $grid ATTACHMENT_GRID */
                $grid = new $class_name($this->app);
                $grid->pager->page_anchor = 'attachments';
                $grid->pager->page_number_var_name = 'attachment_page_number';
                $grid->set_page_size(Default_page_size);
                $grid->set_query($attachment_query);
                $grid->display();
                ?>
  </div>
  <?php 
            }
        }
        if ($this->login->is_allowed(Privilege_set_comment, Privilege_view, $folder)) {
            $com_query = $obj->comment_query();
            if ($com_query->size()) {
                $class_name = $this->app->final_class_name('COMMENT_LIST_RENDERER', 'webcore/gui/comment_renderer.php');
                /** @var $com_renderer COMMENT_LIST_RENDERER */
                $com_renderer = new $class_name($com_query, $obj);
                ?>
      <h2 id="comments" class="clear-both">
        Comments
      </h2>
      <?php 
                $commands = $com_renderer->make_commands();
                if ($commands->num_executable_commands() > 0) {
                    ?>
          <div class="button-content">
            <span class="field"><?php 
                    echo $com_renderer->size();
                    ?>
</span> Replies
            <?php 
                    $menu_renderer = $this->app->make_menu_renderer();
                    $menu_renderer->content_mode = Menu_show_as_buttons;
                    $menu_renderer->display($commands);
                    ?>
          </div>
      <?php 
                }
                ?>
      <div class="grid-content">
        <?php 
                $com_renderer->display();
                ?>
      </div>
      <?php 
            }
        }
    }