When List for WinForms runs in AddItem mode, it is not connected to a data control. Instead, your application must supply and maintain the data, while the list handles all user interaction and data display. In this mode, the functionality of the C1List control is similar in most ways to the standard listbox control.

When populating the list control, the first item starts at zero. Any event that uses a bookmark will use the zero-based index of the control.