NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.
TrackBar Events
| Close | Create | DragDrop |
| Configure | ContextMenu | DropFiles |
| DropObjects | Expose | Help |
| KeyPress | GotFocus | LostFocus |
| MouseDown | MouseUp | MouseMove |
| Select | ThumbDrag | Scroll |