如果方法调用有某些结果，则关闭richfaces popupPanel

I'm trying to get build a simple Login Panel. The Panel is a rich:popupPanel. When the "Login" link/button is clicked I want the Panel to stay open if the login was unsuccessfull (due to wrong username/password, Database errors ... what ever). But the Panel should close if the login was successfull.I'm trying to get build a simple Login Panel. T