Dear Clever people, How do I modify this code (in _GUICtrlListBox_Create) to detect notifications from 2 listboxes. Assume the listboxes are called: $hListBox and hListBox2 Func WM_COMMAND($hWnd, $iMsg, $iwParam, $ilParam) #forceref $hWnd, $iMsg Local $hWndFrom, $iIDFrom, $iCode, $hWndListBox If Not IsHWnd($hListBox) Then $hWndListBox = GUICtrlGetHandle($hListBox) $hWndFrom = $ilParam $iIDFrom = BitAND($iwParam, 0xFFFF) ; Low Word $iCode = BitShift($iwParam, 16) ;