private void showOrdersButton_Click(object sender, RoutedEventArgs e) { UnitsGrid.Visibility = Visibility.Collapsed; OrdersGrid.Visibility = Visibility.Visible; lstOrders = bl.GetOrdersByHost(int.Parse(tb_HostId.Text)).ToList(); this.OrdersViewList.ItemsSource = lstOrders; this.OrdersViewList.Items.Refresh(); }