msos2.hlp (Table of Contents; Topic list)
CBS_DROPDOWN
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CBS_DROPDOWN  Creates a combination-box control containing an entry field
and a drop-down icon that appears as a downward-pointing arrow adjacent to
the entry field. The list box appears only if the user selects the icon. If
the user selects the drop-down icon a second time, the control hides the
list box. The user can enter and edit text in the entry field or choose
items from the list box.
 
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