private void btConsultar_Click(object sender, RoutedEventArgs e) { try { if (((RequisicaoInternaCabecalhoViewModel)DataContext).RequisicaoInternaDetalheSelected != null) { tabDetalhe.IsSelected = true; RequisicaoInternaDetalhe viewDetalhe = new RequisicaoInternaDetalhe(); viewDetalhe.btSair.Click += new RoutedEventHandler(btSair_Click); viewDetalhe.btGravar.Click += new RoutedEventHandler(btGravar_Click); tabDetalhe.Content = viewDetalhe; } else { MessageBox.Show("Selecione um elemento na lista.", "Alerta do sistema"); } } catch (Exception ex) { throw ex; } }