Bug fixed ZK-2138: vflex="1" not working properly with groupbox
http://tracker.zkoss.org/browse/ZK-2138
Bug fixed ZK-2140: Multiple select with Shift key does not work properly
http://tracker.zkoss.org/browse/ZK-2140
Merge remote-tracking branch 'upstream/6.5'
Merge remote-tracking branch 'Noah/B65-ZK-2140' into 6.5
Merge remote-tracking branch 'upstream/6.5'
Bug fixed ZK-2143: Filedownload should support chinese file name
http://tracker.zkoss.org/browse/ZK-2143
Merge remote-tracking branch 'upstream/6.5'
Bug fixed grid-0018: the head should align correct in ie8
B70-ZK-2128: Frozen Tree - cells disappearing after replacing the columns twice http://tracker.zkoss.org/browse/ZK-2128
merge branch of 'B70-ZK-2128' of https://github.com/danchen0720/zk.git
Merge remote-tracking branch 'RaymondChao/B70-ZK-2128'
Bug fixed ZK-2148: NullPointerException in Selectbox after set its model to null
http://tracker.zkoss.org/browse/ZK-2148
Bug fixed ZK-2151: Nested listboxes selection issue
http://tracker.zkoss.org/browse/ZK-2151
Bug fixed B70-ZK-2069: Validation error message does not scroll with component. http://tracker.zkoss.org/browse/ZK-2069
Merge pull request #3 from danchen0720/b70-ZK-2069

Bug fixed B70-ZK-2069: Validation error message does not scroll with com...
Bug refixed ZK-2151: Nested listboxes selection issue
http://tracker.zkoss.org/browse/ZK-2151
fix zkbind testcase (it should has correct listcell as listheader)
Bug fixed ZK-2158: Tab can be click on blank area next to last tab (IE9 only)
http://tracker.zkoss.org/browse/ZK-2158
Merge remote-tracking branch 'Noah/B70-ZK-2151'
Bug fixed ZK-2157: Listheaders not showing if no listitems and Listbox is sized by content
http://tracker.zkoss.org/browse/ZK-2157