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About Combo Boxes
The Microsoft® Win32® application programming interface (API) provides three types of combo box:
simple combo boxes (CBS_SIMPLE), drop-down combo boxes (CBS_DROPDOWN), and
drop-down list boxes (CBS_DROPDOWNLIST).
There are also a number of combo box styles that define specific properties.
For example, two styles enable an application to create an owner-drawn combo
box, making the application responsible for displaying information in the control.
A combo box consists of a list and a selection field. The list presents the
options a user can select and the selection field displays the current selection.
Except in drop-down list boxes, the selection field is an edit control and can
be used to enter text not in the list.
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