-----------------------------------------------------------------------
            "Delphi X-Files" <www.DelphiXFiles.narod.ru>"
    "Текст непосредственно на объекте "glyph" компонента TBitBtn"
-----------------------------------------------------------------------

procedure TForm1.FormCreate(Sender: TObject);
var
  R    : TRect;
  N    : Integer;
  Buff : array[0..255] of Char;
begin
  with BitBtn1 do
  begin
    Caption := 'A really really long caption';
    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;