Merge branch 'issue310' of https://github.com/Keboo/MaterialDesignInXamlToolkit into Keboo-issue310

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.DataGrid.xaml

@@ -175,12 +175,13 @@
             </MultiTrigger>
             <MultiTrigger>
                 <MultiTrigger.Conditions>
-                    <Condition Property="IsSelected" Value="true"/>
+                    <Condition Property="IsSelected" Value="True"/>
                     <Condition Property="Selector.IsSelectionActive" Value="True"/>
                 </MultiTrigger.Conditions>
                 <Setter Property="Foreground" Value="{DynamicResource MaterialDesignBody}"/>
+                <Setter Property="Background" Value="{DynamicResource MaterialDesignSelection}" />
             </MultiTrigger>
-            <Trigger Property="IsEnabled" Value="false">
+            <Trigger Property="IsEnabled" Value="False">
                 <Setter Property="Opacity" Value=".56"/>
             </Trigger>
         </Style.Triggers>