CB_SETDROPPEDWIDTH message

An application sends the CB_SETDROPPEDWIDTH message to set the minimum allowable width, in pixels, of the list box of a combo box with the CBS_DROPDOWN or CBS_DROPDOWNLIST style.

wParam

The minimum allowable width of the list box, in pixels.

lParam

This parameter is not used.

If the message is successful, The return value is the new width of the list box.

If the message fails, the return value is CB_ERR.

By default, the minimum allowable width of the drop-down list box is zero. The width of the list box is either the minimum allowable width or the combo box width, whichever is larger.

CB_GETDROPPEDWIDTH