Toggle buttons to use template binding foreground.

PackIcon is a child of MaterialDesignExpanderToggleButton style. Right, Left, Down, Up styles used.

Author: jherbert

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.Expander.xaml

@@ -101,6 +101,7 @@
                         <ToggleButton Grid.Row="0"
                                       Margin="0 16 0 16"
                                       HorizontalAlignment="Center"
+                                      Foreground="{TemplateBinding Foreground}"
                                       IsChecked="{Binding Path=IsChecked, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                       Style="{StaticResource MaterialDesignExpanderToggleButton}"
                                       RenderTransformOrigin="0.5,0.5">
@@ -134,6 +135,7 @@
                         <ToggleButton Grid.Row="0"
                                       Margin="0 16 0 16"
                                       HorizontalAlignment="Center"
+                                      Foreground="{TemplateBinding Foreground}"
                                       IsChecked="{Binding Path=IsChecked, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                       Style="{StaticResource MaterialDesignExpanderToggleButton}"
                                       RenderTransformOrigin="0.5,0.5">
@@ -170,6 +172,7 @@
                         <ToggleButton Grid.Column="1"
                                       Margin="16 0 16 0"
                                       VerticalAlignment="Center"
+                                      Foreground="{TemplateBinding Foreground}"
                                       IsChecked="{Binding Path=IsChecked, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                       Style="{StaticResource MaterialDesignExpanderToggleButton}"/>
                         <Border BorderBrush="{DynamicResource MaterialDesignDivider}" BorderThickness="0 0 0 1" Grid.ColumnSpan="2" SnapsToDevicePixels="True" />
@@ -197,6 +200,7 @@
                         <ToggleButton IsChecked="{Binding Path=IsChecked, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                           Margin="16 0 16 0"
                                           VerticalAlignment="Center"
+                                          Foreground="{TemplateBinding Foreground}"
                                           Style="{StaticResource MaterialDesignExpanderToggleButton}"
                                           RenderTransformOrigin="0.5,0.5"
                                           Grid.Column="1">