public String waitButtonClick() {
        while (true) {
            for (Widget i = wdg().child; i != null; i = i.next) {
                if (i instanceof Button) {
                    Button b = (Button) i;
                    if (b.isChanged()) return b.text.text;
                }
            }
            if (!JSBot.Sleep(25)) break;
        }
        return "";
    }