public function getField($field)
    {
        // Skip invalid fields
        $fields = $this->compositeDatabaseFields();
        if (!isset($fields[$field])) {
            return null;
        }

        // Check bound object
        if ($this->record instanceof DataObject) {
            $key = $this->getName() . $field;
            return $this->record->getField($key);
        }

        // Check local record
        if (isset($this->record[$field])) {
            return $this->record[$field];
        }
        return null;
    }