Customizing the metamodel : What you can do with USRPROPS/SAPROPS : Layout capabilities : Grids, list and text boxes : List boxes
  
List boxes
There are a variety of list boxes that can be created through property commands. They can be categorized into two types: those that reference a list that is specified by the List command earlier in USRPROPS.TXT or in SAPROPS.CFG, and those that reference a definition (for example, One Of “Class”, List Of “Data”, ParmListOf “Method”, and so on).
Lists that reference a predefined list
Text List
A Text List enables the user to make one selection from the choices provided by the predefined list, or type in their own selection.
LISTONLY
A ListOnly List enables the user to make one selection from the choices provided by the predefined list, and prohibits the user from typing in a new selection. They must choose from the predefined choices.
See also LISTONLY.
LISTONLYCOMBO
Similar to the ListOnly List, the ListOnlyCombo list also makes the list a drop-down combination list even if there are four or less items in the list (if ListOnly is used, this would default to radio buttons).
See also LISTONLYCOMBO.
Lists that reference a definition
ONEOF "<Definition>" LISTOF"<Definition>" ParmListOf "<Definition>"
See also ONEOF and LISTOF