public function addAction(BASE_ContextAction $action)
 {
     if ($action->getParentKey() == null) {
         $this->actions[$action->getKey()]['action'] = $action;
     } else {
         if (!empty($this->actions[$action->getParentKey()])) {
             $this->actions[$action->getParentKey()]['subactions'][$action->getKey()] = $action;
         }
     }
     if ($action->getOrder() === null) {
         $order = $action->getParentKey() === null ? count($this->actions) : count($this->actions[$action->getParentKey()]['subactions']);
         $action->setOrder($order);
     }
 }