title: Xamarin.Forms: Is there any way to set default Font (Family) in derived style in xaml?
body: <p>I need to set (reset) font style to default in some Labels (for instance) when the basic Label style is setup to some specific font family.
  I.e.:</p>
  
  <pre><code>        &lt;Style TargetType="Label"&gt;
              &lt;Setter Property="FontFamily" Value="{StaticResource ThinFontFamily}" /&gt;
          &lt;/Style&gt;
  
  
          &lt;Style TargetType="Label" x:Key="MyCustomStyle"&gt;
              &lt;Setter Property="FontFamily" Value="... to some default"&gt;&lt;/Setter&gt;
          &lt;/Style&gt;
  </code></pre>
  
  <p>There are of course, two other ways: to define all the labels explicitly and use custom renderers, but this is like lots of code.</p>