public SelectUpdatesViewModel()
        {
            Title = "Select the updates you want to install";
            Products = new CollectionViewSource {Source = ProductList};

            Products.GroupDescriptions.Add(new PropertyGroupDescription("Product.IsUpgrade",
                                                                        new IsUpgradeToNiceConverter()));
            var loc = new LocalServiceLocator();
            _updateService = loc.UpdateService;
            CoApp = loc.CoAppService;

            Save = new RelayCommand(() =>
                                        {
                                            Parallel.ForEach(ProductList.ToArray(), i =>
                                                                                        {
                                                                                            if (i.IsSelected)
                                                                                            {
                                                                                                _updateService.
                                                                                                    SelectProduct(
                                                                                                        i.Product);
                                                                                            }
                                                                                            else
                                                                                                _updateService.
                                                                                                    UnselectProduct(
                                                                                                        i.Product);

                                                                                        });
                                            loc.NavigationService.GoTo(ViewModelLocator.PrimaryViewModelStatic);
                                        });

            ElevateBlock = new RelayCommand<SelectableProduct>(ExecuteElevateBlock, p => true);
            Block = new RelayCommand<SelectableProduct>(ExecuteBlock, p => true);

            Loaded += OnLoaded;
        }