public function adminDuplicate()
    {
        $newItem = $this->duplicate();
        $message = _t(
            __CLASS__ . '.CopyMessage',
            'Created a copy of {title}',
            ['title' => Convert::raw2js($this->Title)]
        );

        return <<<JS
            statusMessage($message, 'good');
            $('Form_EditForm').loadURLFromServer('admin/subsites/show/$newItem->ID');
JS;
    }