The main idea for this UDF came from by Melba23. Example: #include <GUIConstantsEx.au3> #include <GUIButton.au3> #include "GUISpoiler.au3" $hGUI = GUICreate('GUISpoiler Example', 400, 80) $iSpoiler = _GUICtrlSpoiler_Create(20, 20, '', '', 0) GUICtrlCreateLabel('Label', 20, 20, 50, 20) $hButton = _GUICtrlButton_Create($hGUI, 'External', 20, 40, 60, 20, $BS_SPLITBUTTON) _GUICtrlSpoiler_AddExternalControl($iSpoiler, $hButton) _GUICtrlSpoiler_Close($iSpoiler) $iSpoiler2 = _GUICt