[NumLock]

Код:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs;

type
  TGraphicControl1 = class(TGraphicControl)
  private
    FNum: Integer;
    procedure SetNum(const Value: Integer);
  protected
    procedure Paint; override;
  public
    property Num: Integer read FNum write SetNum;
  end;

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

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ TGraphicControl1 }

procedure TGraphicControl1.Paint;
begin
  Canvas.Brush.Color:=clWhite;
  Canvas.FillRect(ClientRect);
  Canvas.Font.Size:=14;
  Canvas.Font.Color:=clBlack;
  Canvas.TextOut(10, 10, IntToStr(FNum));
end;

procedure TGraphicControl1.SetNum(const Value: Integer);
begin
  if Value<>FNum then
  begin
    FNum:=Value;
    Invalidate;
  end;
end;

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
begin
  with TGraphicControl1.Create(Self) do
  begin
    Parent:=Self;
    Left:=100;
    Top:=100;
    Width:=100;
    Height:=100;
    Num:=$10000;
  end;
end;

end.