I've looked everywhere for this and the only solution given is to use BitOR($CBS_DROPDOWNLIST,$CBS_AUTOHSCROLL), which stops the user from entering their own information into the control. However, by doing this, the scrollbar disappears if you have a lot of entries. Take a look at this: #include <ComboConstants.au3> $GUI = GUICreate("", 625, 443) $cmCountries = GUICtrlCreateCombo("", 232, 64, 145, 25, BitOR($CBS_DROPDOWNLIST,$CBS_AUTOHSCROLL)) GUICtrlSetData(-1, "Afghanistan|Albania|