Gravitybox ListBar - Version 3.0 This control allows you to build applications with the ListBar popularized by MS-Outlook. The ListBar is a substitute for a treeview of two levels. There is a collection of tabs that serve as the root of the tree. Each tab has an associated collection of items, each with text and an icon. All objects, tabs and tab items, have a tooltiptext property so you can display additional information to the user. Make your applications windows standard with this control.