title: Setting the Background of NumericUpDown
body: <p>I have the following XAML:</p>
  
  <pre><code>&lt;toolkit:NumericUpDown Background="White"/&gt;
  </code></pre>
  
  <p>However, this doesn't change the background-color of the control. I already tried to assign a background over the <strong>SpinnerTemplate</strong>, but this doesn't work either. Is there any way I can make this control have a background without having to make a new template?</p>