title: NavigationPage BarBackgroundColor does not work on Xamarin.Android
body: <p>I have XF app which gives the user an option to change from Light to Dark theme with a button click. I am using the below code:</p>
  
  <pre><code>&lt;ResourceDictionary xmlns="http://xamarin.com/schemas/2014/forms" 
                      xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
                      x:Class="Japanese.NavBackgroundRes"&gt;
      &lt;Style TargetType="NavigationPage"&gt;
          &lt;Setter Property="BarBackgroundColor" Value="{DynamicResource GridBackgroundColor}"/&gt;
          &lt;Setter Property="BarTextColor" Value="{DynamicResource LabelTextColor}" /&gt;
      &lt;/Style&gt;
  &lt;/ResourceDictionary&gt;
  </code></pre>
  
  <p>This works perfectly on iOS but not in Android. The <code>BarTextColor</code> property works for both iOS and Android but the <code>BarBackgroundColor</code> only works on iOS. Anyone knows why that is? I am debugging on a physical device if that helps.</p>