title: Responsive Windows App Element
body: <p>Is there any XAML element that  will automatically wrap to a new line for sub elements that don't have enough room on a line?</p>
  
  <p>What I mean is that on a wide screen I'll get:</p>
  
  <pre><code>Box1 Box2 Box3
  </code></pre>
  
  <p>And on a narrow one:</p>
  
  <pre><code>Box1 Box2
  
  Box3
  </code></pre>
  
  <p><em>Without</em> having to listen to events and fix it by code.</p>
  
  <p>The comments mention <code>VariableSizedWrapGrid</code> as a solution. But I can't figure out how to make it wrap.</p>