I\'m using more than one TabContainer on a page in an ASP.NET project and I noticed a really strange behavior: when the page is loaded the focus jumps to the last TabContain
window.Sys.Application.findComponent('<%=tabContainer.ClientID %>');
tabContainer.set_activeTabIndex(1); ( //Here set the id of the last tab that is the index of the last tab. Index will start with 0 upto last - 1 as in array.. )