protected function _get( $config,  $parts )
	{
		if( ( $current = array_shift( $parts ) ) !== null && isset( $config[$current] ) )
		{
			if( count( $parts ) > 0 ) {
				return $this->_get( $config[$current], $parts );
			}

			return $config[$current];
		}

		return null;
	}