private void AddVehicle_Click(object sender, RoutedEventArgs e)
 {
     AddVehicle window = new AddVehicle();
     if (window.ShowDialog().Value)
     {
         this.TransportViewModel.Vehicles.Add(window.DataContext as VehicleInfo);
     }
 }
 private void AddVehicle_Click(object sender, RoutedEventArgs e)
 {
     AddVehicle window = new AddVehicle();
     if (window.ShowDialog().Value)
     {
         this.TransportViewModel.Vehicles.Add(window.DataContext as VehicleInfo);
     }
 }