protected async Task LoadContent()
{
CanGoNext = false;
Loading = true;
var userTask = UserViewModel.LoadContent();
var deliveryTask = DeliveryViewModel.LoadContent();
await Task.WhenAll(userTask, deliveryTask);
var dataSource = new MvxObservableCollection <IMvxViewModel>();
dataSource.AddRange(UserViewModel.Items);
dataSource.AddRange(DeliveryViewModel.Items);
Items = dataSource;
CanGoNext = true;
Loading = false;
DeliveryViewModel.PropertyChanged += DeliveryViewModel_PropertyChanged;
}
