I added WM_MOUSEWHEEL support: #include <GUIConstants.au3> #include <Misc.au3> #cs #define SB_HORZ 0 #define SB_VERT 1 #define SB_CTL 2 #define SB_BOTH 3 /* * Scroll Bar Commands */ #define SB_LINEUP 0 #define SB_LINELEFT 0 #define SB_LINEDOWN 1 #define SB_LINERIGHT 1 #define SB_PAGEUP 2 #define SB_PAGELEFT 2 #define SB_PAGEDOWN 3 #define SB_PAGERIGHT 3 #define SB_