Change the button captions in a message dialog box

function MyMessageDialog(const Msg: string; DlgType: TMsgDlgType;
  Buttons: TMsgDlgButtons; Captions: array of string): Integer;
var
  aMsgDlg: TForm;
  i: Integer;
  dlgButton: TButton;
  CaptionIndex: Integer;
begin
  { Create the Dialog }
  aMsgDlg := CreateMessageDialog(Msg, DlgType, Buttons);
  captionIndex := 0;
  { Loop through Objects in Dialog }
  for i := 0 to aMsgDlg.ComponentCount - 1 do
  begin
   { If the object is of type TButton, then }
    if (aMsgDlg.Components[i] is TButton) then
    begin
      dlgButton := TButton(aMsgDlg.Components[i]);
      if CaptionIndex > High(Captions) then Break;
      { Give a new caption from our Captions array}
      dlgButton.Caption := Captions[CaptionIndex];
      Inc(CaptionIndex);
    end;
  end;
  Result := aMsgDlg.ShowModal;
end;

Usage example:

procedure TForm1.Button1Click(Sender: TObject);
begin
  if MyMessageDialog('How much...?', mtConfirmation, mbOKCancel,
    ['1', '2']) = mrOk then
    ShowMessage('"1" clicked')
  else
    ShowMessage('"2" clicked');
end;