Listview SelectedItem не привязывается

У меня возникла проблема, когда я пытаюсь использовать список для отображения списка объектов и отправки их на новую страницу. Однако BrandBox.isSelected возвращает значение null.

.xaml

     <Grid >
        <ListView x:Name = "BrandBox" HorizontalAlignment = "Stretch" VerticalAlignment = "Top" SelectedItem = "{Binding ItemSelected, Mode=TwoWay}" SelectionChanged = "Selector_OnSelectionChanged">
            <ListView.View>
                <GridView>
                    <GridViewColumn>
                        <GridViewColumn.CellTemplate >
                            <DataTemplate>
                                <StackPanel Orientation = "Vertical" VerticalAlignment = "Stretch" HorizontalAlignment = "Stretch" Width = "128">
                                    <Image Source = "{Binding BrandImageLoc}" HorizontalAlignment = "Stretch" VerticalAlignment = "Top" Stretch = "UniformToFill" />
                                    <TextBlock Text = "{Binding BrandName}" HorizontalAlignment = "Stretch" VerticalAlignment = "Bottom" />
                                </StackPanel>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>

.cs

        List<Brand> Brands = new List<Brand>();

        public ManufactuerList()
        {
            InitializeComponent();

            Brands = App.career.Brands;
            this.BrandBox.ItemsSource = Brands;

        }

        private void Selector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Brand selectedBrand = BrandBox.SelectedItem as Brand;
            this.NavigationService.Navigate(new CarsPurchaseable(selectedBrand));
        }