Merge pull request #112 from jerrywell/6.5

Bug ZK-2404: In IE7, timebox cannot keep updating minutes/seconds/am/pm ...
Bug ZK-2409: Combobox drop-down not open on top of input if using sub model
refixed Bug ZK-2409: Combobox drop-down not open on top of input if using sub model
Bug ZK-2416: Listheader not aligned with Listcells