SL13: Providing A Style Switcher To Switch To High Contrast

<UserControl x:Class="HighContrast.MainPage"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
   mc:Ignorable="d"
   d:DesignHeight="300" d:DesignWidth="400">
   <UserControl.Resources>
       <SolidColorBrush x:Key="ArtsyBrush1" Color="Salmon"/>
       <SolidColorBrush x:Key="ArtsyBrush2" Color="Bisque"/>
       <SolidColorBrush x:Key="ArtsyBrush3" Color="DarkSalmon"/>
       <SolidColorBrush x:Key="ArtsyBrush4" Color="Blue"/>
       <Color x:Key="ArtsyBrush1Restore">Salmon</Color>
       <Color x:Key="ArtsyBrush2Restore">Bisque</Color>
       <Color x:Key="ArtsyBrush3Restore">DarkSalmon</Color>
       <Color x:Key="ArtsyBrush4Restore">Blue</Color>
       <RadialGradientBrush x:Key="ArtsyGradient">
           <GradientStop Color="AliceBlue" Offset="0"/>
           <GradientStop Color="LightBlue" Offset="0.4"/>
           <GradientStop Color="#D00000EE" Offset="1"/>
       </RadialGradientBrush>
       <Style x:Key="ArtsyButton" TargetType="Button">
           <Setter Property="Template">
               <Setter.Value>
                   <ControlTemplate TargetType="Button">
                       <Border CornerRadius="4"
                          BorderBrush="{StaticResource ArtsyBrush4}" BorderThickness="4">
                           <Grid>
                               <Rectangle Fill="{StaticResource ArtsyGradient}"
                                 RadiusX="2" RadiusY="2"/>
                               <ContentPresenter Content="{TemplateBinding Content}"
                               ContentTemplate="{TemplateBinding ContentTemplate}"/>
                           </Grid>
                           
                       </Border>
                   </ControlTemplate>
               </Setter.Value>
           </Setter>
       </Style>
       <Style x:Key="HighConButton" TargetType="Button">
           <Setter Property="Control.Background" Value="White"/>
           <Setter Property="BorderBrush" Value="Black"/>
           <Setter Property="Foreground" Value="Black"/>
       </Style>
   </UserControl.Resources>
   <Border BorderBrush="{StaticResource ArtsyBrush1}" BorderThickness="4">
       <StackPanel x:Name="LayoutRoot" Background="{StaticResource ArtsyBrush2}">
           <TextBlock
             Foreground="{StaticResource ArtsyBrush3}">High contrast demo</TextBlock>
           <Button Name="Switcher" Click="Switcher_Click"
             Width="160" Style="{StaticResource HighConButton}">
              <TextBlock Text="Switch to high contrast"/>
           </Button>
           <Button Name="Switchback" Click="Switchback_Click"
             Width="160" Style="{StaticResource HighConButton}" IsEnabled="False">
               <TextBlock Text="Switch to regular theme"/>
           </Button>
       </StackPanel>
   </Border>
</UserControl>

       private void Switcher_Click(object sender, RoutedEventArgs e)
       {
           ChangeToHighCon();
       }
       private void ChangeToHighCon()
       {
           (this.Resources["ArtsyBrush1"] as SolidColorBrush).Color = Colors.Black;
           (this.Resources["ArtsyBrush2"] as SolidColorBrush).Color = Colors.White;
           (this.Resources["ArtsyBrush3"] as SolidColorBrush).Color = Colors.Black;
           (this.Resources["ArtsyBrush4"] as SolidColorBrush).Color = Colors.Black;
           Switcher.IsEnabled = false;
           Switchback.IsEnabled = true;
       }
       private void RestoreRegularCon()
       {
           (this.Resources["ArtsyBrush1"] as SolidColorBrush).Color =
             (Color)this.Resources["ArtsyBrush1Restore"];
           (this.Resources["ArtsyBrush2"] as SolidColorBrush).Color =
             (Color)this.Resources["ArtsyBrush2Restore"];
           (this.Resources["ArtsyBrush3"] as SolidColorBrush).Color =
           (Color)this.Resources["ArtsyBrush3Restore"];
           (this.Resources["ArtsyBrush4"] as SolidColorBrush).Color =
             (Color)this.Resources["ArtsyBrush4Restore"];
           Switcher.IsEnabled = true;
           Switchback.IsEnabled = false;
       }
       private void Switchback_Click(object sender, RoutedEventArgs e)
       {
           RestoreRegularCon();
       }
   }

       public MainPage()
       {
           InitializeComponent();
           if (SystemParameters.HighContrast)
           {
               ChangeToHighCon();
           }
       }