Can not define dependencyproperty of type "byte"?

I want to define a byte type dp in a windows store app project, but got a runtime error like this:

An exception of type 'Windows.UI.Xaml.Markup.XamlParseException' occurred in App6.exe but was not handled in user code



WinRT information: Cannot deserialize XBF metadata property list as 'Id' was not found in type 'null'. [Line: 0 "text-decoration:underline;">Additional information: The text associated with this error code could not be found.

Is this a bug or something I am not aware of?(I am using vs2013 and WinRT8.1)

Here is the source code:

[MainPage.cs]

namespace App1
{
    public sealed class MyClass2
    {
        public byte Id { get; set; }
    }

    public sealed class MyClass: DependencyObject
    {
        public byte Id
        {
            get { return (byte)GetValue(IdProperty); }
            set { SetValue(IdProperty, value); }
        }
        public static readonly DependencyProperty IdProperty =
            DependencyProperty.Register("Id", typeof(byte), typeof(MyClass), new PropertyMetadata(0));
    }

    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }
    }
}

[MainPage.xaml]

<Page
    x:Class="App1.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App6"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Page.Resources>
        <local:MyClass2 x:Key="MyObj2" />
        <local:MyClass x:Key="MyObj"
                       Id="{Binding Id, Source={StaticResource MyObj2}}"/>
    </Page.Resources>
    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    </Grid>
</Page>