I installed AJAXControlToolkit .NET 3.5 which I downloaded from Codeplex and I was trying to follow the steps here - http://www.asp.net/ajax/videos/how-do-i-use-the-aspnet-ajax-tabs-control but I am not seeing the TabPanel control in my Toolbox. Do I have the wrong version of the AJAXControlToolkit? What am I doing wrong?