protected function _getConfigValue( array $keys, $default = null )
	{
		$srvconfig = $this->getServiceItem()->getConfig();

		foreach( $keys as $key )
		{
			if( isset( $srvconfig[$key] ) ) {
				return $srvconfig[$key];
			}

			if( isset( $this->_beGlobalConfig[$key] ) ) {
				return $this->_beGlobalConfig[$key];
			}
		}

		return $default;
	}