public static function createView($sCtrlName = null, $sActionName)
    {
        $sViewsRoot = AppHelper::getInstance()->getComponentRoot('views');
        $sAddPath   = '';
        if (!empty($sCtrlName)) {
            $sAddPath .= DIRECTORY_SEPARATOR.strtolower($sCtrlName);
        }
        $sViewFile = $sViewsRoot.$sAddPath.DIRECTORY_SEPARATOR
            .strtolower($sActionName).'.php';
        if (is_readable($sViewFile)) {
            return new View($sViewFile);
        }
        return null;
    }