protected function handleSaveCallback($field, $widget, $value)
    {
        $newValue = $value;

        if (isset($field['save_callback']) && is_array($field['save_callback'])) {
            foreach ($field['save_callback'] as $callback) {
                $this->import($callback[0]);

                try {
                    $newValue = $this->{$callback[0]}->{$callback[1]}($newValue, $this);
                } catch (Exception $e) {
                    $widget->addError($e->getMessage());
                    $this->blnSubmitInput = false;

                    return $value;
                }
            }
        }

        return $newValue;
    }