title: Change backgorund of button in wpf when it has focus
body: <p>I have a button and I want to change the background color of button. but when I set the background property to a color like blue:</p>
  
  <pre><code>&lt;Button Width="75" Height="25" Margin="6" Background="Blue"/&gt;
  </code></pre>
  
  <p>and when the button has focus, the color changes in white and my color.</p>
  
  <p>How can I set this white color to another color?</p>