Refixed B70-ZK-2130: Frozen Tree - columns flicker and width changes when resizing the browser http://tracker.zkoss.org/browse/ZK-2130
Merge pull request #5 from danchen0720/Refix-B70-ZK-2130

Refixed B70-ZK-2130: Frozen Tree - columns flicker and width changes whe...
Merge branch 'master' of https://github.com/zkoss/zk into B70-ZK-2130
Bug refixed ZK-2130: Frozen Tree - columns flicker and width changes when resizing the browser
http://tracker.zkoss.org/browse/ZK-2130
Merge remote-tracking branch 'Noah/B70-ZK-2130'