/**
  *
  *
  * @internal revisions
  * @since 1.9.14
  * allow multiple selection (if advanced mode)
  */
 private function init_filter_workflow_status()
 {
     $key = 'filter_workflow_status';
     if (!$this->tc_mgr) {
         $this->tc_mgr = new testcase($this->db);
     }
     // handle filter reset
     $selection = $this->args->{$key};
     if (!$selection || $this->args->reset_filters) {
         $selection = null;
     } else {
         $this->do_filtering = true;
     }
     $this->filters[$key] = array('items' => array(), 'selected' => $selection);
     // load domain
     // add "any" string to these types at index 0 as default selection
     $this->filters[$key]['items'] = array(0 => $this->option_strings['any']) + $this->tc_mgr->getWorkFlowStatusDomain();
     $this->filters[$key]['size'] = min(count($this->filters[$key]['items']), self::ADVANCED_FILTER_ITEM_QUANTITY);
     $this->active_filters[$key] = $selection;
 }