#Include <GUIConstantsEx.au3>
GUICreate('MyGUI', 300, 200)
$Combo = GUICtrlCreateCombo('', 10, 10, 280, 21)
GUICtrlSetData(-1, 'Item1|item2|Item3', 'item1')
GUISetState()
While 1
$Msg = GUIGetMsg()
Switch $Msg
Case $GUI_EVENT_CLOSE
ExitLoop
Case $Combo
MsgBox(0, 'Combo Event', GUICtrlRead($Combo))
EndSwitch
WEnd