Release 10.1A: OpenEdge Development:
AppBuilder

Combo boxes

The combo box object combines a fill-in with a selection list. You might use it in cases where:

The user will have to choose a single item from a list.
A radio-button set is not an appropriate representation.

A combo box will generally be a better representation than a radio set when the set of choices is large, varies in size, or involves long strings. A drop-down list or combo box will generally be a better choice than a simple list or combo box when space is at a premium, as is often the case. Drop-down lists/combo boxes also visually emphasize the current choice more than radio sets or simple lists/combo boxes do.

AppBuilder offers two different combo box objects for your use:

The basic 4GL combo box.
An ActiveX (OCX) combo box.