public function DownloadLink() {
		// get the base URL, prepend with the external content
		// controller /download action and add this object's id
		$cur = Controller::curr();
		if ($cur instanceof ExternalContentPage_Controller) {
			return $cur->data()->LinkFor($this, 'download');
		}
		return ExternalContentPage_Controller::URL_STUB . '/download/' . $this->ID;
	}