route OnKeyPress event to procedure

hi experts, i would like to route all TWinControl control's OnKeyPress event to my local procedure as follow. why it's error "undeclared identifier: 'OnKeyPress' ? isn't TWinControl the base class of this event ?

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
  private
    procedure ev_OnKeyPress(Sender: TObject; var Key: Char);
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
var
  wc : TWinControl;
  t : TList;
  i : Integer;
begin
  t := TList.Create;
  try
    t.Add(Edit1);
    t.Add(Button1);
    for i := 0 to t.Count -1 do
      TWinControl(t[i]).OnKeyPress := ev_OnKeyPress;
  finally
    t.Free;
    t := nil;
  end;
end;
procedure TForm1.ev_OnKeyPress(Sender: TObject; var Key: Char);
begin

end;

end.