page.setGateway(null);
    public IPage edit(IRequestCycle cycle, Integer id, Integer ruleId) {        String editPageName = getEditPageName();        EditGateway page = (EditGateway) cycle.getPage(editPageName);        page.setGatewayId(id);        page.setRuleId(ruleId);        page.setCallback(new PageCallback(getPage()));        return page;    }