title: WPF: How to set background of TabItem?
body: <p>How to set the background of TabItem? I tried the following code:</p>
  
  <pre><code>&lt;TabControl&gt;
      &lt;TabItem Header="Test" Background="Blue" Foreground="Red" /&gt;
  &lt;/TabControl&gt;
  </code></pre>
  
  <p><code>Foreground</code> works, but <code>Background</code> does not work.</p>
  
  <p><img src="https://i.stack.imgur.com/rWOpt.png" alt="enter image description here"></p>
  
  <p>Any ideas? Thanks</p>