频繁选择不同的组合框项导致winrt手机应用程序崩溃

我的应用程序崩溃了，所以我做了这个示例应用程序，这个也崩溃了。

xaml:

<Grid>
    <StackPanel Grid.Row="0" Orientation="Vertical" >
        <StackPanel Orientation="Horizontal">
            <TextBlock x:Uid="EmirateTextBlock" />
        </StackPanel>
        <ComboBox PickerFlyoutBase.Title=" " Name="EmirateComboBox" x:Uid="EmirateComboBox" PlaceholderText="" DisplayMemberPath="vcPlateSource" />
        <StackPanel Orientation="Horizontal">
            <TextBlock x:Uid="CategoryTextBlock" />
        </StackPanel>
        <ComboBox PickerFlyoutBase.Title=" " Name="CategoryComboBox" x:Uid="CategoryComboBox" PlaceholderText="" DisplayMemberPath="vcPlateCateg"  />
    </StackPanel>
</Grid>
</Page>

cs文件:

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        PopulateComboBox();
        this.NavigationCacheMode = NavigationCacheMode.Required;
    }
    /// <summary>
    /// Invoked when this page is about to be displayed in a Frame.
    /// </summary>
    /// <param name="e">Event data that describes how this page was reached.
    /// This parameter is typically used to configure the page.</param>
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        // TODO: Prepare page for display here.
        // TODO: If your application contains multiple pages, ensure that you are
        // handling the hardware Back button by registering for the
        // Windows.Phone.UI.Input.HardwareButtons.BackPressed event.
        // If you are using the NavigationHelper provided by some templates,
        // this event is handled for you.
    }
    public class stbPlateSource
    {
        public int tiPlateSourceId { get; set; }
        public string cCountryCode { get; set; }
        public string vcPlateSourceDesc { get; set; }
        public string vcPlateSource
        {
            get
            {
                if (!IsEnglish)
                {
                    return nvcPlateSourceArbDesc;
                }
                else
                {
                    return vcPlateSourceDesc;
                }
            }
        }
        public static bool IsEnglish { get; set; }
        public string nvcPlateSourceArbDesc { get; set; }
        public int tiDisplayOrder { get; set; }
    }
    public class stbPlateCateg
    {
        public int Id { get; set; }
        public int tiPlateCategId { get; set; }
        public int tiPlateSourceId { get; set; }
        public string vcPlateCategDesc { get; set; }
        public string nvcPlateCategArbDesc { get; set; }
        public static bool IsEnglish { get; set; }
        public string vcPlateCateg
        {
            get
            {
                if (!IsEnglish)
                {
                    return this.nvcPlateCategArbDesc;
                }
                else
                {
                    return this.vcPlateCategDesc;
                }
            }
        }
        public stbPlateCateg() { }
    }
    private void PopulateComboBox()
    {
        // Step1
        List<stbPlateSource> Emirates = new List<stbPlateSource>();
        for (int i = 0; i < 250; i++)
        {
            Emirates.Add(new stbPlateSource() {
                 cCountryCode = "05" + i,
                 tiDisplayOrder = i+1,
                 tiPlateSourceId = 101 + i,
                 vcPlateSourceDesc = "asd" + i,
                 nvcPlateSourceArbDesc = "dsa" + i
            });
        }
        stbPlateSource.IsEnglish = true;
        EmirateComboBox.ItemsSource = Emirates;
        List<stbPlateCateg> PlateCategory = new List<stbPlateCateg>();
        for (int i = 0; i < 250; i++)
        {
            PlateCategory.Add(new stbPlateCateg()
            {
                Id = 201 + i,
                tiPlateCategId = i + 1,
                tiPlateSourceId = 101 + i,
                vcPlateCategDesc = "asd" + i,
                nvcPlateCategArbDesc = "dsa" + i
            });
        }
        stbPlateCateg.IsEnglish = true;
        CategoryComboBox.ItemsSource = PlateCategory.OrderBy(x => x.tiPlateCategId);

        EmirateComboBox.SelectedIndex = 1;
        CategoryComboBox.SelectedIndex = 0;
    }

}

当我频繁更改组合框所选项目时，应用程序崩溃了，虽然我原来的应用程序经常崩溃，但这次崩溃时间很长。

当它在我调试的时候崩溃了，它只是崩溃了，没有任何异常。我不知道该怎么处理。

我没有任何证据但是我认为这是某种内存异常

<Button Name="EmirateComboButton"  Click="EComboButton_Click" Style="{StaticResource ListboxButton}" />
<ListBox Name="EComboListBox" x:Uid="EComboListBox" Visibility="Collapsed" Tapped="EComboListBox_Tapped" SelectionChanged="EComboListBox_SelectionChanged" 
    Style="{StaticResource ListboxCombo}" DisplayMemberPath="vcPSource" ItemsSource="{Binding EBind}"
    >
</ListBox>