问题
I'm using Primefaces 3.0.M4 with JSF2. I created a page divided into some layout units. In one layout unit I have a selectOneMenu. When the page is rendered the select works just fine, but if I collapse the layout unit and restore it back, the select doesn't work anymore. I can see it, I click it but nothing happens. Is there a solution to this?
来源：https://stackoverflow.com/questions/7790277/primefaces-layout-bug