OnClick event override

I have my custom class witch is derived from TButton:

TLoginResultEvent = procedure (Sender: TObject; LoginResult: boolean) of object;
TLoginButton = class(TButton)
    private
      fLogin: TLoginChooser;
      fOnClick: TLoginResultEvent;
    public
      constructor Create(AOwner: TComponent); override;
      destructor Destroy; override;

      procedure OnClickResult(Sender: TObject; LoginResult: boolean);
    published
      property Login: TLoginChooser read fLogin write fLogin;
      property OnClick: TLoginResultEvent read fOnClick write fOnClick;
  end;

in constructor I added:

constructor TLoginButton.Create(AOwner: TComponent);
begin
  inherited;

  fOnClick := OnClick;
  OnClick := OnClickResult;
end;

But when I click on the button it's not firing OnClickResult, what am I doing wrong? Is it possible to "override" OnClick event handler or should I hide it and make for example OnResultClick event?