title: Custom back button - back glyph and circle missing
body: <p>After editing a copy of the back button, I noticed that the back glyph and the circle are not appearing (a rectangle appears instead). How can I change the shape to a circle and show the back glyph? Please do not refer to <code>StandardStyles.xaml</code>.</p>
  
  <pre><code>        &lt;Style x:Key="ButtonStyleNavy" TargetType="Button"&gt;
          &lt;Setter Property="Background" Value="{ThemeResource ButtonBackgroundThemeBrush}"/&gt;
          &lt;Setter Property="Foreground" Value="#000099"/&gt;
          &lt;Setter Property="BorderBrush" Value="#000099"/&gt;
          &lt;Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}"/&gt;
          &lt;Setter Property="Padding" Value="12,4,12,4"/&gt;
          &lt;Setter Property="HorizontalAlignment" Value="Left"/&gt;
          &lt;Setter Property="VerticalAlignment" Value="Center"/&gt;
          &lt;Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/&gt;
          &lt;Setter Property="FontWeight" Value="SemiBold"/&gt;
          &lt;Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/&gt;
          &lt;Setter Property="Template"&gt;
              &lt;Setter.Value&gt;
                  &lt;ControlTemplate TargetType="Button"&gt;
                      &lt;Grid&gt;
                          &lt;VisualStateManager.VisualStateGroups&gt;
                              &lt;VisualStateGroup x:Name="CommonStates"&gt;
                                  &lt;VisualState x:Name="Normal"/&gt;
                                  &lt;VisualState x:Name="PointerOver"&gt;
                                      &lt;Storyboard&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPointerOverBackgroundThemeBrush}"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonPointerOverForegroundThemeBrush}"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                      &lt;/Storyboard&gt;
                                  &lt;/VisualState&gt;
                                  &lt;VisualState x:Name="Pressed"&gt;
                                      &lt;Storyboard&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="#000099"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="White"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                      &lt;/Storyboard&gt;
                                  &lt;/VisualState&gt;
                                  &lt;VisualState x:Name="Disabled"&gt;
                                      &lt;Storyboard&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Border"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBackgroundThemeBrush}"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Border"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledBorderThemeBrush}"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                          &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter"&gt;
                                              &lt;DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ButtonDisabledForegroundThemeBrush}"/&gt;
                                          &lt;/ObjectAnimationUsingKeyFrames&gt;
                                      &lt;/Storyboard&gt;
                                  &lt;/VisualState&gt;
                              &lt;/VisualStateGroup&gt;
                              &lt;VisualStateGroup x:Name="FocusStates"&gt;
                                  &lt;VisualState x:Name="Focused"&gt;
                                      &lt;Storyboard&gt;
                                          &lt;DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualWhite"/&gt;
                                          &lt;DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisualBlack"/&gt;
                                      &lt;/Storyboard&gt;
                                  &lt;/VisualState&gt;
                                  &lt;VisualState x:Name="Unfocused"/&gt;
                                  &lt;VisualState x:Name="PointerFocused"/&gt;
                              &lt;/VisualStateGroup&gt;
                          &lt;/VisualStateManager.VisualStateGroups&gt;
                          &lt;Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="3"&gt;
                              &lt;ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/&gt;
                          &lt;/Border&gt;
                          &lt;Rectangle x:Name="FocusVisualWhite" IsHitTestVisible="False" Opacity="0" StrokeDashOffset="1.5" StrokeEndLineCap="Square" Stroke="{ThemeResource FocusVisualWhiteStrokeThemeBrush}" StrokeDashArray="1,1"/&gt;
                          &lt;Rectangle x:Name="FocusVisualBlack" IsHitTestVisible="False" Opacity="0" StrokeDashOffset="0.5" StrokeEndLineCap="Square" Stroke="{ThemeResource FocusVisualBlackStrokeThemeBrush}" StrokeDashArray="1,1"/&gt;
                      &lt;/Grid&gt;
                  &lt;/ControlTemplate&gt;
              &lt;/Setter.Value&gt;
          &lt;/Setter&gt;
      &lt;/Style&gt;
  </code></pre>