Drop-Down

This style should be used when space for the Combo-Box is limited, for example when the combo box is part of a toolbar. With this style, the list, part of the Combo-Box, is normally hidden and shown only when the user clicks the button on the right of the entry area. The user can pick a value from the list or enter any value in the entry area.

Drop-List

This style has the same effect as the DROP-DOWN style, with the exception that the entry area is read-only.

Static-List

This syntax is compiled for compatibility reasons, however, isCOBOL does not support Static-List Combo Boxes.