Telerik RadPanelbar is a flexible tool that helps you build collapsible panelbar menus in a matter of minutes. Developed as a fully managed .NET server control it generates DHTML output using an XML content file. The extensive visual customization makes it a convenient solution for most sites, intranets and Web applications. The product offers "OnClick" and "Target" attributes, as well as full support for images. Other handy options are "SingleExpanded" and "InitialState", which control the panelbar behavior.