title: How to change selected view highlight in WinUI 3
body: <p>How to change the appearance (e.g height, width, color, position, etc.) of the selected view indicator (the blue line)?</p>
  <ol>
  <li><p>TextBox example:
  <a href="https://i.stack.imgur.com/mL4N0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mL4N0.png" alt="TextBox example" /></a></p>
  </li>
  <li><p>ComboBox example:
  <a href="https://i.stack.imgur.com/nEwCw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nEwCw.png" alt="ComboBox example" /></a></p>
  </li>
  </ol>
  <hr />
  <p>Edit 1:
  This is the only thing I found on the internet and it <strong>DIDN'T</strong> work.</p>
  <pre><code>&lt;ComboBox.Resources&gt;
      &lt;SolidColorBrush 
          x:Key=&quot;ComboBoxItemBackgroundSelected&quot; Color=&quot;#FF0000&quot; /&gt;
      &lt;SolidColorBrush 
          x:Key=&quot;ComboBoxItemBackgroundSelectedPointerOver&quot; Color=&quot;#FF0000&quot; /&gt;
   &lt;/ComboBox.Resources&gt;
  </code></pre>