In Visual Studio 2008, the property RunAt is disable for controls,
then I have to agregate (runat = "server") in html code,
how can enable this property without to write that code.

Thanks.

runat is included with serverside controls not clientside controls, if you drag a server table control you get the runat if you slide in a html table object you will not get the runat......

try adding both and see the differences