[Yurk@]

А вот так тебе не подойдёт:

Код:

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms;
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
  public
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
Form1.Canvas.Rectangle(250,250,350,350);
end;

end.