public function extra_permalink_field_buttons($return, $id, $new_title, $new_slug)
 {
     $return = parent::extra_permalink_field_buttons($return, $id, $new_title, $new_slug);
     //make sure this is only when editing
     if (!empty($id)) {
         $href = EE_Admin_Page::add_query_args_and_nonce(array('action' => 'duplicate_event', 'EVT_ID' => $id), $this->_admin_base_url);
         $title = esc_attr__('Duplicate Event', 'event_espresso');
         $return .= '<a href="' . $href . '" title="' . $title . '" id="ee-duplicate-event-button" class="button button-small"  value="duplicate_event">' . $title . '</button>';
     }
     return $return;
 }