ASP.NET Ajax Control toolkit – Common Problems
June 13, 2008
Problem 1 : This page is missing a HtmlHead control which is required for the CSS stylesheet link that is being added. Please add <head runat=”server” />
Solution : make your HEAD tag to <HEAD runat=”server”>
problem 2 : The Controls collection cannot be modified because the control contains code blocks (i.e. <% … %>).