The Extender controls, part of ASP.NET Web Forms Edition, allow you to move from Web Forms to AJAX-style development, focusing on the client side to create rich, interactive Web applications for your customers.

Extender controls provide additional properties for Web server controls at design time, allowing you to extend the functionality of the controls and provide a richer Web experience for your end users, all without having to use any code. The Wijmo control toolkit offers over 30 of these extender controls to cover all of your Web app needs!

The Wijmo extender controls are added to the Visual Studio Toolbox, but they do not have a visual presence on the page. You can, however, drag them to your source markup and assign the TargetControlID property to the ID of the Web server control you want to extend. The extender properties then become available for the specified control. Note that if you add an extender but do not attach it to a control, the extender will appear as a placeholder on the page.

For example, suppose you want to create an accordion. You add a standard Panel control to your page and enter some text that will eventually become the accordion content. If you add the C1AccordionExtender control to the markup and set the TargetControlID property to the panel, the panel content is now formatted as an accordion, and you didn't even enter a single line of code! It's so simple. And using the C1AccordionExtender properties, you can customize the accordion: change the expand direction, choose an animation effect, select a theme, and more.