Occurs when the list portion of a combo box is about to drop-down.

bforward = DROPDOWN (ctrlentID, ctrlclassID, editlinetext)

DROPDOWN accepts arguments for the following parameters.

ctrlentIDHas the format WindowName.ControlName, where WindowName is the identifier of the window that contains the affected control, and ControlName is the identifier of the control. Notice that a period separates the two values.
ctrlclassIDThe type of control that recognizes the event. The combo box control is the only valid entry.
editlinetextThe text in the edit line of the combo box.

True or false. If false, the program execution returns to the calling procedure. If true, the event processing goes to the next level.

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