/**
  * Displays row of buttons that go along the bottom of a discussion.
  * @return string HTML code for all feature buttons in this discussion
  */
 public function display_forumngfeature_discussions()
 {
     // Get forum type
     $type = $this->get_forum()->get_type();
     // Print discussion features
     $features = '';
     foreach (forumngfeature_discussion::get_all() as $feature) {
         if ($feature->should_display($this) && $type->allow_forumngfeature_discussion($this, $feature)) {
             $features .= $feature->display($this);
         }
     }
     if ($features) {
         print '<div id="forumng-features">' . $features . '</div>';
     }
 }