Fix bug ZK-1712: The disabled date in the databox shall not be selected when navigate to the different month
http://tracker.zkoss.org/browse/ZK-1712
Fix bug ZK-1718: Datebox's calendar does not disable the date after costraint date if the "before yyyymmdd" is not at the first place of the constraint attribute
http://tracker.zkoss.org/browse/ZK-1718
Bug fixed B65-ZK-1728: Invisible Comboitems are selectable with cursor
keys  http://tracker.zkoss.org/browse/ZK-1728
Fix bug ZK-1726: Treeitem update - infinite loop - browser freeze
http://tracker.zkoss.org/browse/ZK-1726
Merge remote-tracking branch 'VincentJian/B65-ZK-1726'
add case
Merge branch 'B65-ZK-1728' of git://github.com/huangnoah/zk