WinRT の既定の [戻る] ボタンの一部を変更しようとしていますが、うまくいきません。これは StandardStyles.xaml の xaml です。
<!--
BackButtonStyle is used to style a Button for use in the title area of a page. Margins appropriate for
the conventional page layout are included as part of the style.
-->
<Style x:Key="BackButtonStyle" TargetType="Button">
<Setter Property="MinWidth" Value="0"/>
<Setter Property="Width" Value="48"/>
<Setter Property="Height" Value="48"/>
<Setter Property="Margin" Value="36,0,36,36"/>
<Setter Property="VerticalAlignment" Value="Bottom"/>
<Setter Property="FontFamily" Value="Segoe UI Symbol"/>
<Setter Property="FontWeight" Value="Normal"/>
<Setter Property="FontSize" Value="56"/>
<Setter Property="AutomationProperties.AutomationId" Value="BackButton"/>
<Setter Property="AutomationProperties.Name" Value="Back"/>
<Setter Property="AutomationProperties.ItemType" Value="Navigation Button"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid x:Name="RootGrid">
<Grid Margin="-1,-16,0,0">
<TextBlock x:Name="BackgroundGlyph" Text="" Foreground="{StaticResource BackButtonBackgroundThemeBrush}"/>
<TextBlock x:Name="NormalGlyph" Text="{StaticResource BackButtonGlyph}" Foreground="{StaticResource BackButtonForegroundThemeBrush}"/>
<TextBlock x:Name="ArrowGlyph" Text="" Foreground="{StaticResource BackButtonPressedForegroundThemeBrush}" Opacity="0"/>
</Grid>
<Rectangle
x:Name="FocusVisualWhite"
IsHitTestVisible="False"
Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}"
StrokeEndLineCap="Square"
StrokeDashArray="1,1"
Opacity="0"
StrokeDashOffset="1.5"/>
<Rectangle
x:Name="FocusVisualBlack"
IsHitTestVisible="False"
Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}"
StrokeEndLineCap="Square"
StrokeDashArray="1,1"
Opacity="0"
StrokeDashOffset="0.5"/>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackgroundGlyph" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonPointerOverBackgroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="NormalGlyph" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonPointerOverForegroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackgroundGlyph" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonForegroundThemeBrush}"/>
</ObjectAnimationUsingKeyFrames>
<DoubleAnimation
Storyboard.TargetName="ArrowGlyph"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0"/>
<DoubleAnimation
Storyboard.TargetName="NormalGlyph"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="RootGrid" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="FocusVisualWhite"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0"/>
<DoubleAnimation
Storyboard.TargetName="FocusVisualBlack"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused" />
<VisualState x:Name="PointerFocused" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
すべての州の色を黒に設定したいだけです。「メトロ」矢印を維持しながらこれを行うにはどうすればよいですか?