private void buttonUpdateTempo_Click(object sender, EventArgs e)
 {
     using (ICommand cmd = Program.GetCommand())
     {
         //TODO: try, catch & handle return
         cmd.ActualizarPromocaoTemporal(textBoxId.Text,
                                        textBoxInicio.Text,
                                        textBoxFim.Text,
                                        textBoxDescricao.Text,
                                        textBoxTempoExtra.Text);
     }
 }