public function getCleanValue($name)
    {
        if (array_key_exists($name, $this->_cleanData)) {
            return $this->_cleanData[$name];
        }
        foreach ($this->_getSiblingRows() as $r) {
            if (array_key_exists($name, $r->_cleanData)) {
                return $r->_cleanData[$name];
            }
        }
        return $this->__get($name);
    }