Foreground color updates header and icon

Author: jherbert

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.Expander.xaml

@@ -70,7 +70,7 @@
                             </VisualStateGroup>
                         </VisualStateManager.VisualStateGroups>
                         <wpf:PackIcon Kind="ChevronDown" Opacity=".38" x:Name="ExpandPath" RenderTransformOrigin="0.5,0.5"
-                                      Height="24" Width="24">
+                                      Height="24" Width="24" Foreground="{Binding RelativeSource={RelativeSource AncestorType={x:Type Expander}}, Path=Foreground}">
                             <wpf:PackIcon.RenderTransform>
                                 <TransformGroup>
                                     <ScaleTransform/>
@@ -278,6 +278,7 @@
                                           Style="{StaticResource MaterialDesignExpanderDownHeaderStyle}"
                                           TextElement.FontSize="15"
                                           Opacity=".87"
+                                          Foreground="{TemplateBinding Foreground}"
                                           Content="{TemplateBinding Header}"
                                           ContentTemplate="{TemplateBinding HeaderTemplate}"
                                           ContentTemplateSelector="{TemplateBinding HeaderTemplateSelector}"
@@ -347,4 +348,4 @@
         </Setter>
     </Style>
 
-</ResourceDictionary>
+</ResourceDictionary>