A combination box combines the capabilities of both a single-line entry field and a list box. The user can enter a value into the entry field by selecting a line from the list box, or by typing a value directly into the entry field.
If a call to reply to message is made in the response to a combination list box, the user must use the following code to make the entry field update with the selected item:
change object text to (textual line
(selected line from object) from object)
The keyword dropdown specifies that this is a drop-down combination box. In this case, the list box is normally hidden, and a down arrow is displayed to the right of the entry field. Selecting the arrow displays the list box, allowing the user to make a selection. The list box is then hidden.
The size and position of the combination box include both the entry field and list box, even if the list box is hidden.
Note that responses for drop-down combination boxes are generated only when a line from the list-box portion of the combination box is selected.