Bug fixed B65-ZK-2035: Invalidate a Panel component with a button will cause a js error http://tracker.zkoss.org/browse/ZK-2035
Merge branch of B65-ZK-2035 of https://github.com/danchen0720/zk.git
fix ZK-1552.zul
Merge branch '6.5' of https://github.com/zkoss/zk into B65-ZK-1552