Reproducing Steps

1. get source code from https://code.google.com/p/zkbind/source/browse/#svn%2Fbranches%2Frichlet%2Fzkbind-examples
2. modify pom.xml, change zk.version to "ZK 6.0.2.FL.20120607"
3. start a server and connect to the richlet http://localhost:8080/zkbind-examples/zk/order
4. listbox renders incorrectly. it contains 5 rows without content.
5. richlet class is org.zkoss.bind.examples.order.richlet.OrderRichlet
   even we binder.init(window, new OrderVM4()); to binder.init(window, new OrderVM4(),null);, the rendering result is still incorrect.