private function _getFormSubmitValueByFieldIDAsString($sFieldID)
{
static $_aCaches = array();
$_aCaches[$sFieldID] = isset($_aCaches[$sFieldID]) ? $_aCaches[$sFieldID] : $this->oFactory->oUtil->getElement($_POST, array($this->oFactory->oProp->sOptionKey, $this->sSectionID, $sFieldID), '');
return trim((string) $_aCaches[$sFieldID]);
}