ASP.NET Explorer Bar
Navigate expandable groups of elements using the common navigational UI found across Web sites, windowing environments and applications such as Outlook® 2010 and Windows® 7.
Load on Demand
Groups can load lazily when the user expands them, or cache the content loaded initially to avoid taxing the network.
Control its many behaviors and elements to create accordion-style groups, or whatever look and feel you are after. Enable, disable, mouseover and select items, have your items contain yet other items hierarchically, associate images with items and more.
Use ASP.NET Templates to display whatever complex content you want within your expanded groups.
Bind groups and items to your data to create a more easily extensible, data-driven user interface.
Customize animation effects on expansion and collapse, and set duration and how you want the animated transition to feel (ease-in, bounce, etc.).