unit fanyo;

interface

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

type
  TForm1 = class(TForm)
    bok: TBitBtn;
    bcancelar: TBitBtn;
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    procedure FormShow(Sender: TObject);
    procedure FormKeyPress(Sender: TObject; var Key: Char);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormShow(Sender: TObject);
begin
  edit1.SetFocus;
end;

procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
begin
  if key = #13 then
    BEGIN
        Perform(WM_NextDLGCtl, 0, 0);
        key:=#0;
    END;
end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
   if not (key in ['0'..'9']) then
     key := #0;
end;

end.