problemas com bloqueio de teclas

-------------------EXEMPLO 1 --------------------------------------------
procedure TLogin.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
CanClose := False;
end;
-----------------------------------------------------------------------------

------------------EXEMPLO 2 ---------------------------------------------
  public
  { Public declarations }
  fecha: Boolean;
  end;
 
implementation
 
{$R *.DFM}
 
Function GetStateK (Key: integer): boolean;
begin
  Result := Odd (GetKeyState (Key));
end;
 
procedure Tfrm_HIP.FormClose(Sender: TObject; var Action: TCloseAction);
begin
If Not fecha Then
Action := caNone Else
Action := caFree;
end;
 
procedure Tfrm_HIP.FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
If GetStateK (VK_LMENU) And (Key = VK_F4) Then
fecha 
--------------------------------------------------------------------------------