public static function save($title = null)
    {
        $toolbar = Toolbar::getInstance(self::$_toolbar);
        $title   = (empty($title)) ? __d('core', 'Save') : $title;

        $toolbar->appendButton('Core.action', $title, self::ACTION_SAVE, [
            'icon'      => 'check',
            'class'     => 'jsFormButton',
            'iconClass' => 'ckTextGreen',
            'button'    => 'grey lighten-3',
        ]);
    }