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Why explicit Style defined in a theme Which had been applied for one control aren't  update when change the Theme ?.

Main.xaml: (This is a resume of main.xaml , to see full have a look the attached file)

<UserControl>
    <Grid x:Name="LayoutRoot" Background="White" >
        <!--[PROBLEM]: This Border Style doesn't refresh when the Theme changed-->
        <Border Style="{StaticResource BorderStyle2}">
            <Button Click="Change_to_Dark_Click"
                        Height="20">Select Dark Theme</Button>
        </Border>
    </Grid>
</UserControl>


Main.xaml.cs : (This is a resume of main.xaml.cs, to see full have a look the attached file)
       private void Change_to_Dark_Click(object sender, RoutedEventArgs e)
        {
            //Cleannig
            App.Current.Resources.Clear();
            App.Current.Resources.MergedDictionaries.Clear();
            Theme.SetApplicationThemeUri(App.Current, null);

            Uri themeUri = new Uri("/Controls.Dark;component/Generic.xaml", UriKind.RelativeOrAbsolute);
            Theme.SetApplicationThemeUri(Application.Current, themeUri);
        //The theme changed but the style of Border doesn't change.
    }

There is a Controls project "Controls.csproj" (to see full have a look the attached file) with:
Generic.xaml
Style.xaml
ButtonCustomized.xaml

There are 2 themes projects  created like this "Controls.Dark.csproj" (to see full have a look the attached file):
Generic.xaml
Style.xaml

Generic.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:controls="clr-namespace:Controls;assembly=Controls">
    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="/Controls.Dark;component/Style.xaml" />
        <ResourceDictionary Source="/Controls;component/Themes/ButtonCustomized.xaml" />
    </ResourceDictionary.MergedDictionaries>

</ResourceDictionary>

Style.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Color x:Key="KeyColor">#FDB800</Color>
    <Color x:Key="KeyColor2">#FBD8AB</Color>
    <SolidColorBrush x:Key="KeyColorBrush"
                     Color="{StaticResource KeyColor}" />
    <SolidColorBrush x:Key="KeyColorBrush2"
                     Color="{StaticResource KeyColor2}" />
    
    <Style x:Key="BorderStyle1"
           TargetType="Border">
        <Setter Property="Background"
                Value="{StaticResource KeyColorBrush}" />
    </Style>

    <Style x:Key="BorderStyle2"
           TargetType="Border">
        <Setter Property="Background"
                Value="{StaticResource KeyColorBrush2}" />
    </Style>
</ResourceDictionary>

I don't know why the explicit style doesn't are updates when change theme of the application?

Thanks for the future answers, regards.

http://silverlight.codeplex.com/workitem/10224