Bug ZK-2402: In IE8, clicking the "up/down" arrow of timebox does not always trigger an onChange event
Bug ZK-2404: In IE7, timebox cannot keep updating minutes/seconds/am/pm values by repeatedly clicking the "up/down" arrows
Merge pull request #112 from jerrywell/6.5

Bug ZK-2404: In IE7, timebox cannot keep updating minutes/seconds/am/pm ...