请各位赐教！
------解决方案--------------------------------------------------------
try ->
function SetActiveTab(index) {
var ctrl = $find("TabContainer1");
var tabpanel = ctrl.get_tabs()[index];
ctrl.set_activeTab(tabpanel);
}
------解决方案--------------------------------------------------------
See also: http://www.cnblogs.com/blodfox777/archive/2008/11/06/1328068