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unit pp;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons, Grids;

type
  TStringGrid=Class(Grids.TStringGrid)
    procedure WMVScroll(var Message: TWMVScroll); message WM_VSCROLL;
  end;

  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    procedure SpeedButton1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.SpeedButton1Click(Sender: TObject);
begin

end;

{ TStringGrid }

procedure TStringGrid.WMVScroll(var Message: TWMVScroll);
begin
   if Message.ScrollCode = 5 then Message.ScrollCode := 4;
   inherited;
end;

end.