Плохо искали . Вот кусочек из DEFINE BAR

PROMPT cMenuItemText
Specifies the caption that appears on the menu item.
You can create a separator bar by specifying a backslash and a dash (\-) for cMenuItemText. A separator bar is used to separate item groups on a menu. For example, including the following command in a menu definition creates a separator bar between the third and fifth menu items:

DEFINE BAR 4 OF popMyPopup PROMPT '\-'