In 4D 2004.3, the SHOW LISTBOX SCROLLBAR command has been renamed SET SCROLLBAR VISIBLE. The SET SCROLLBAR VISIBLE command is located in the “Object Properties” theme and can be used with several form objects that include scrollbars:
- List boxes
- Scrollable areas
- Subforms

Both the horizontal and vertical parameters are mandatory. In the case of scrollable areas, the horizontal parameter must still be passed; however, it will be ignored.

Additional information about the SET SCROLLBAR VISIBLE can be found at:
https://www.4d.com/docs/CMU/CMU00843.HTM