title: NavigationView Pane background
body: <p>How can I change the NavigationView Pane background?? </p>
  
  <p>I'm trying this way:</p>
  
  <pre><code>&lt;NavigationView.Background&gt;
     &lt;LinearGradientBrush EndPoint="0.5,0" StartPoint="0.5,1"&gt;
        &lt;GradientStop Color="#b1c899" Offset="0"/&gt;
        &lt;GradientStop Color="#18c1b9" Offset="1"/&gt;
     &lt;/LinearGradientBrush&gt;
  &lt;/NavigationView.Background&gt;
  </code></pre>
  
  <p>But it seems to have "<code>acrylic</code>" that I can not remove, as well as changing the background color of the <code>Header</code>.</p>