Bug fixed ZK-1980: Toolbarbutton click failed when draggable true
http://tracker.zkoss.org/browse/ZK-1980
Bug fixed B70-ZK-2059: Upload button doesn't work if it is disabled at the beginning
http://tracker.zkoss.org/browse/ZK-2059
Merge remote-tracking branch 'RaymondChao/B70-ZK-2059'