Apr 18, 2012 02:03 PM|mm10|LINK
You won't be able to find the li:s with id tab_* in server side code as they are NOT server controls, it's just simple text which happens to have a textual runat=server attribute which means nothing in this context.
You never see the runat=server attribute in the rendered HTML for a server control.
For example, if you write this in the markup for an ASPX page:
...it will render without the runat="server" in the browser: