Commented Unassigned: IE8 TabContainer Not Visible [27625]

Using Net Framework 4.03. Ajax Control Toolkit 4.1.7.1213 (14/12/2013)
The Tab Container Control in IE 8 is not visible (OK in IE10)
The error is "Object doesn't support this property or method"
File: jQuery.Tabs.TabPanel.debug.js
Line: self._tabIndex = opt.owner.get_tabs().length;

Comments: Remainder of code section: ``` return n>=t._tabs.length&&(n=t._tabs.length-1),t._created&&n==i.activeTabIndex||(i.activeTabIndex!=-1&&t._tabs[i.activeTabIndex]._set_active(!1),i.activeTabIndex=n,r=t._tabs[i.activeTabIndex],i.activeTabIndex!=-1&&r._set_active(!0),i.onDemand&&(u=r.options.onDemandMode,u!="None"&&((u!="Once"||r.options.wasLoadedOnce)&&u!="Always" ```