title: WPF how to restore Button background color
body: <p>This question felt so simple but I just can't find the answer:</p>
  
  <p>How to change a Button back to its default? My VS2010 start giving me button with strange color and I have to manually set the Button to look like its default self.</p>
  
  <p>I tried:</p>
  
  <blockquote>
    <p><code>btn.Background = null; // only make it transparent, not default background</code></p>
  </blockquote>
  
  <p>Anyone?</p>
  
  <p><img src="https://i.stack.imgur.com/iGhIw.png" alt="enter image description here"></p>