This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
In your change method, at the very end, you need to forward JSF to the render phase. I forget the exact API call. But that is what I see missing, and something that everyone misses using value change event.