delphi中的DBGRid鼠标滚动事件

Procedure OnMouseWheel(Var Msg :TMsg;var Handled:Boolean);
begin
  if Msg.message = WM_MouseWheel then
  begin
    if Msg.wParam > 0 then
     begin
       if DBGrid.Focused then
       begin
         SendMessage(DBGrid1.Handle,WM_KEYDOWN,VK_UP,0);
       end;
     end
    else
     begin
       if DBGrid.Focused then
         SendMessage(DBGrid1.Handle,WM_KEYDOWN,VK_DOWN,0);
     end;
    Handled:= True;
  end;
end;

需要在Form创建的时候写入
Application.OnMessage:=OnMouseWheel; // 截获鼠标滚动事件