Как узнать о нажатии non-menu клавиши в момент когда меню показано?

Code:

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, Menus;

type

   TForm1 = class(TForm)

       MainMenu1: TMainMenu;

       One1: TMenuItem;

       Two1: TMenuItem;

       THree1: TMenuItem;

   private

       {Private declarations}

       procedure WmMenuChar(var m : TMessage); message WM_MENUCHAR;

   public

       {Public declarations}

end;

var

   Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WmMenuChar(var m : TMessage);

begin

   Form1.Caption := 'Non standard menu key pressed';

   m.Result := 1;

end;

end.