#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#Include <GuiComboBox.au3>
$Form1 = GUICreate("Form1", 202, 134, 192, 124)
$Combo1 = GUICtrlCreateCombo("", 16, 16, 169, 25, BitOR($GUI_SS_DEFAULT_COMBO,$CBS_DROPDOWNLIST,$CBS_DISABLENOSCROLL))
GUICtrlSetData ($Combo1, "value1|value2|value3|value4|value5|value6|value7|value8", "value6")
$Button1 = GUICtrlCreateButton("Previous", 112, 72, 75, 25)
GUISetState(@SW_SHOW)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $Button1
$iCurSel = _GUICtrlComboBox_GetCurSel($Combo1)
If $iCurSel > 0 Then
_GUICtrlComboBox_SetCurSel($Combo1, $iCurSel - 1)
EndIf
EndSwitch
WEnd