Fazendo o caption de um bitbtn ficar com várias linhas

Unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Buttons;

type
TForm1 = class(TForm)
BitBtn1: TBitBtn;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.FormCreate(Sender: TObject);
var
R : TRect;
N : Integer;
Buff : array[0..255] of Char;
begin
with BitBtn1 do
begin
Caption := 'Várias linhas no caption de um botão';
Glyph.Canvas.Font := Self.Font;
Glyph.Width := Width - 6;
Glyph.Height := Height - 6;
R := Bounds(0, 0, Glyph.Width, 0);
StrPCopy(Buff, Caption);
Caption := '';
DrawText(Glyph.Canvas.Handle, Buff,StrLen(Buff),R,
DT_CENTER or DT_WORDBREAK or DT_CALCRECT);
OffsetRect(R,(Glyph.Width - R.Right) div 2,
(Glyph.Height - R.Bottom) div 2);
DrawText(Glyph.Canvas.Handle, Buff, StrLen(Buff), R,
DT_CENTER or DT_WORDBREAK);
end;
end;
end.