public function getViewPath()
    {
        // Cache mechanism
        if (self::$_viewPath) {
            return self::$_viewPath;
        }
        
        // Called widget filepath
        $reflectionClass = new ReflectionClass($this);
        $widgetPath = dirname($reflectionClass->getFileName());
        // For Codeigniter view which doesn't support absolute path
        $relativePath = str_replace(APPPATH, '', $widgetPath);

        // Real relative view path for Codeigniter
        return self::$_viewPath = "../{$relativePath}/views/";
    }