title: Change button color when disabled
body: <p>I use the following button and when isDisabled is true the button is transparent
  (here its always true for the example but in my program its bound to command...)
  what I want is that when the button is disabled the color remain the same just ligther,
  how can I achive that?</p>
  
  <p></p>
  
  <pre><code>    &lt;Button  
                               Width="100"
                               Height="25"
                               Background="#f0ab00"
                               Content="Run"
                               FontSize="16"
                               Foreground="#ffffff"
                               IsDefault="True"
                               Margin="10,0,20,0"
                               IsEnabled="false" /&gt;
  
  &lt;/Grid&gt;
  </code></pre>