Bug fixed ZK-1552: Combobox and Datebox scroll position in Borderlayout
http://tracker.zkoss.org/browse/ZK-1552
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
Merge remote-tracking branch 'upstream/6.5'