Короче вот посмарите исходник:
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, MPlayer;

type
TForm1 = class(TForm)
Button1: TButton;
ResultEdit: TEdit;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Button6: TButton;
Button7: TButton;
Button8: TButton;
Button9: TButton;
Button10: TButton;
Button11: TButton;
DeleteButton: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin

ResultEdit.Text:=IntToStr(1);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
ResultEdit.Text:=IntToStr(2);
end;

end.