XAML that demonstrates issue with CaretBrush and shared resources

CaretBrushResourceExample

<phone:PhoneApplicationPage
    x:Class="CaretBrushTest.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    SupportedOrientations="Portrait"
    shell:SystemTray.IsVisible="True">

    <phone:PhoneApplicationPage.Resources>
        <SolidColorBrush Color="#FF00FF" x:Key="MyColor" />
    </phone:PhoneApplicationPage.Resources>

    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock Text="CARETBRUSH SHARED RESOURCE TEST" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0"/>
        </StackPanel>

        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <TextBox CaretBrush="{StaticResource MyColor}" />
            <Button Grid.Column="1" Content="something" Foreground="{StaticResource MyColor}" />
            <TextBlock Grid.Row="1" Grid.ColumnSpan="2" Foreground="{StaticResource MyColor}" Style="{StaticResource PhoneTextLargeStyle}">do i flash?</TextBlock>
            <TextBlock Grid.Row="2" Grid.ColumnSpan="2" Foreground="#FF00FF" Style="{StaticResource PhoneTextLargeStyle}">another flasher?</TextBlock>
            <Rectangle Grid.Row="3" Grid.ColumnSpan="2" Fill="{StaticResource MyColor}" Height="50" />
        </Grid>
    </Grid>

</phone:PhoneApplicationPage>