Drop-Down Lists
Certain notifications and messages apply only to combo boxes containing
drop-down lists. When a drop-down list is open or closed, the parent window of a
combo box receives a notification in the form of a
WM_COMMAND message. If the list is being opened, the high-order word of
wParam is
CBN_DROPDOWN. If the list is being closed, it is
CBN_CLOSEUP.
An application can open the list of a drop-down combo box or drop-down list
box by using the
CB_SHOWDROPDOWN message. It can determine whether the list is open by using the
CB_GETDROPPEDSTATE message and can determine the coordinates of a drop-down list by using the
CB_GETDROPPEDCONTROLRECT message. An application can also increase the width of a drop-down list by
using the
CB_SETDROPPEDWIDTH message.
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