Changer le texte d'un bouton dans un Open / SaveDialog

procedure TForm1.Button1Click(Sender: TObject);
begin
if Opendialog1.Execute then
begin
{....}
end;
end;

procedure TForm1.OpenDialog1Show(Sender: TObject);
begin
SetDlgItemText(GetParent(OpenDialog1.Handle), IDOK, PChar('New &Open'));
SetDlgItemText(GetParent(OpenDialog1.Handle), IDCANCEL, PChar('New &Cancel'));
end;