Форум

$templateData["HEADSTRING"] = $arResult["PROPERTIES"]["HEADSTRING"];

global $APPLICATION;
$cp = $this->__component; // объект компонента
if (is_object($cp))
{
    $cp->arResult["HEADSTRING"] = $arResult["PROPERTIES"]["HEADSTRING"];
    $cp->SetResultCacheKeys(array('HEADSTRING'));
    $arResult['HEADSTRING'] = $cp->arResult['HEADSTRING'];
}

global $APPLICATION;

if (isset($arResult["HEADSTRING"]["~VALUE"]))
    $APPLICATION->AddHeadString($arResult["HEADSTRING"]["~VALUE"],true);