public void Exibir()
        {
            if (formaberto == false)
            {
                monitor                          = new MonitorOperacoes(Linear.Parametros);
                monitor.AoNotificar             += Monitor_AoNotificar;
                monitor.Shown                   += Monitor_Shown;
                monitor.FormClosing             += Monitor_FormClosing;
                monitor.buttonItemIniciar.Click += IniciarFinalizar;
                monitor.FormClosed              += (object fcsender, FormClosedEventArgs fce) => { formaberto = false; };
                monitor.Show();
                formaberto = true;

                backgroundSerialPedestre.WorkerReportsProgress      = true;
                backgroundSerialPedestre.WorkerSupportsCancellation = true;
                backgroundSerialPedestre.DoWork += Background_DoWorkPedestre;

                backgroundSerialVeiculo.WorkerReportsProgress      = true;
                backgroundSerialVeiculo.WorkerSupportsCancellation = true;
                backgroundSerialVeiculo.DoWork += Background_DoWorkVeiculo;
            }
        }