function addContextButtonTo(&$buttons) {
		$contextHref = $this->getContextHref($this->getFootprintId());
		if (!$contextHref) return;
		$qSep = strPos($contextHref, '?') ? '&' : '?';
		$contextHref = $contextHref. $qSep. 'pntScd=u&pntRef='
			. $this->controller->converter->urlEncode($this->getFootprintId());
		
		$contextHref = $this->getConverter()->toJsLiteral($contextHref, "'");
		$buttons[]=$this->getButton('Context',	"document.location.href=$contextHref;");
	}