Indicates that the user has double-clicked on an item in a list-box or combo-box (returning this event), and that the box does not have a TERMINATION-VALUE or EXCEPTION-VALUE associated with it. This will occur only if the application requests it via the NOTIFY-DBLCLICK list-box and combo-box styles. EVENT-DATA-1 is the index of the selected item in the list (starting at 1). EVENT-DATA-2 is not used.