Space and content distribution is a very important part when designing a web site. That's why breaking content into multiple sections using a tabbed widget in order to save space is commonly used technique in web design these days.
Today I'm going to address a common issue that arises when using a tab widget, which is enabling/disabling specific tabs. But first let's talk a little bit about the Ajax Control Toolkit. The Ajax Control Toolkit provides a palette of AJAX enabled controls, with the purpose of creating an "interactive web experience". If you work with ASP .NET, you MUST have heard about ASP .NET AJAX, previously known as ATLAS. You must also have seen and feel familiar with update panels and Microsoft's ASP .NET AJAX paradigm. Certainly the ASP .NET AJAX framework makes AJAX implementation trivial to anyone.