These combination-box control styles are available:
CBS_SIMPLE
Both the entry field control and the
list box control are visible. When the selection changes in the list box
control, the text of the selected item in the list box control is placed
in the entry field. Also, the text in the entry field is completed by extending
the text of the entry field with the closest match from the list box.
CBS_DROPDOWN
Inherits all the properties of a combination-box
control with a style of CBS_SIMPLE and, in addition, the list box control
is hidden until the user requests that it should be displayed.
CBS_DROPDOWNLIST
In which the entry field control is replaced by
a static control, that displays the current selection from the list box
control. The user must explicitly cause the display of the list box control
in order to make alternative selections in the list box.
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