title: XAML: Get parent background
body: <p>I need to set a control's background to the color of the parent's background in XAML. Why not simply make the background transparent? It's a button with a drop shadow, so I need to set the background; otherwise, the drop shadow shows through.</p>
  
  <p>So, from my control's markup, how do I set the Background property equal to whatever the parent (host) Background is? Thanks for your help.</p>