From the help file for _GUICtrlRebar_AddToolBarBand Top is AutoIt v3.3.6.1 Bottom is AutoIt v3.3.8.0 #include <GuiConstantsEx.au3> #include <GuiReBar.au3> #include <GuiToolBar.au3> #include <WindowsConstants.au3> #include <Constants.au3> Opt("MustDeclareVars", 1) $Debug_RB = False _Main() Func _Main() Local $hgui, $btnExit, $hToolbar, $hReBar, $hInput Local Enum $idNew = 1000, $idOpen, $idSave, $idHelp $hgui = GUICreate("Rebar", 400, 396, -1, -1,