LCL don't support it. Pls apply this diff- only constant LM_MouseHWHeel
https://msdn.microsoft.com/en-us/library/windows/desktop/ms645614(v=vs.85).aspx
Index: lcl/lmessages.pp =================================================================== --- lcl/lmessages.pp (revision 56436) +++ lcl/lmessages.pp (working copy) @@ -215,6 +215,7 @@ LM_XBUTTONUP = $020C; LM_XBUTTONDBLCLK = $020D; LM_MOUSELAST = $020D; + LM_MOUSEHWHEEL = $020E; LM_PARENTNOTIFY = $0210; LM_CAPTURECHANGED = $0215; @@ -935,6 +936,7 @@ LM_MBUTTONUP : Result := 'LM_MBUTTONUP'; LM_MBUTTONDBLCLK : Result := 'LM_MBUTTONDBLCLK'; LM_MOUSEWHEEL : Result := 'LM_MOUSEWHEEL'; + LM_MOUSEHWHEEL : Result := 'LM_MOUSEHWHEEL'; LM_XBUTTONDOWN : Result := 'LM_XBUTTONDOWN'; LM_XBUTTONUP : Result := 'LM_XBUTTONUP'; LM_XBUTTONDBLCLK : Result := 'LM_XBUTTONDBLCLK';
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