public function displayType()
    {
        if ($this->displayType === null) {
            $ident    = $this->ident();
            $metadata = $this->adminSecondaryMenu();

            if (isset($metadata[$ident]['display_type'])) {
                $this->setDisplayType($metadata[$ident]['display_type']);
            } else {
                $this->displayType = '';
            }
        }

        return $this->displayType;
    }