Изменить заголовки компонент различных классов

unit TextPF;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    CheckBox1: TCheckBox;
    Label1: TLabel;
    Memo1: TMemo;
    ListBox1: TListBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

type
  TControlHack = class (TControl);

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
begin
  for I := 0 to ControlCount - 1 do
    TControlHack (Controls [I]).Text :=
      TControlHack (Controls [I]).Text + '*';
end;

end.