public manutencaoForm(string s, int ID)
 {
     InitializeComponent();
     _controller = new manutencaoController();
     _veiculos   = new veiculosController();
     _recibo     = new recibosController();
     observer    = new Counter();
     observer.RegisterObserver(VeiculosView.Instance);
     observer.RegisterObserver(FinanceiroView.Instance);
     observer.RegisterObserver(Estatisticas.Instance);
     _state = s;
     obj    = _veiculos.ObterPorId(ID);
     if (obj.Status == "Em Manutenção")
     {
         _id    = obj.ID;
         _state = "devolve";
         LoadData();
     }
 }