public static function cancel($title = null, $url = null, array $options = [])
    {
        $toolbar = Toolbar::getInstance(self::$_toolbar);
        $options += [
            'icon'      => 'close',
            'iconClass' => 'ckTextRed',
            'button'    => 'grey lighten-3'
        ];

        if (empty($url)) {
            $url = ['action' => 'index'];
        }

        $title = (empty($title)) ? __d('core', 'Cancel') : $title;

        $toolbar->appendButton('Core.link', $title, $url, $options);
    }