Как заставить корректно работать колесо мыши в TDBGrid?

{....}

public
  procedure AppMessage(var Msg: TMsg; var Handled: Boolean);

{....}



procedure TForm1.AppMessage(var Msg: TMsg; var Handled: Boolean);
var
  i: SmallInt;
begin
  {Mouse wheel behaves strangely with dgbgrids - this proc sorts this out}
  if Msg.message = WM_MOUSEWHEEL then
  begin
    Msg.message := WM_KEYDOWN;
    Msg.lParam := 0;
    i := HiWord(Msg.wParam);
    if i > 0 then
      Msg.wParam := VK_UP
    else
      Msg.wParam := VK_DOWN;

    Handled := False;
  end;
end;

  // And in the project source:

{....}

Application.OnMessage := Form1.AppMessage;

{....}