code: public function removeItem($item)
      {
          if (isset($this->items[$item->name])) {
              foreach ($this->children as &$children) {
                  unset($children[$item->name]);
              }
              foreach ($this->assignments as &$assignments) {
                  unset($assignments[$item->name]);
              }
              unset($this->items[$item->name]);
              $this->saveItems();
              $this->saveAssignments();
              return true;
          }
  
          return false;
      }
docs: {@inheritdoc}