To Prevent the default vertical scrolling action, the event handler sets the Handled parameter to true. I think that we should probably add this separately. One PR adds the SHIFT + scroll support (which gönül be done already) and a second PR should be made for WM_MOUSEHWHEEL hook (which takes https://www.csharpegitimi.com.tr/2024/05/csharp-mouse-click-kullanimi.html