Как перехватывать горячие клавиши в StringGrid

type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure StringGrid1KeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
    procedure CMDialogChar(var Message: TCMDialogChar);
      message CM_DIALOGCHAR;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Button1.Caption := 'E&xit';
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Application.Terminate;
end;

procedure TForm1.StringGrid1KeyDown(Sender: TObject;
  var Key: Word; Shift: TShiftState);
begin
  ShowMessage('Grid keypress = ' + Char(Key));
  Key := 0;
end;

procedure TForm1.CMDialogChar(var Message: TCMDialogChar);
begin
  if ssAlt in KeyDataToShiftState(Message.KeyData) then
    inherited;
end;