title: How do I get stackpanel to resize to fit the controls it's stacking?
body: <p>I'm making a toolbar.  I want the width of the window to equal the total width of the buttons.  StackPanel seems perfect for the job because it lines everything up, but it won't stretch.</p>
  
  <pre><code>  &lt;Window Width="auto"&gt;
       &lt;StackPanel Orientation="Horizontal" Width="auto"&gt;
          &lt;Button /&gt;
          &lt;Button /&gt;
       &lt;/StackPanel&gt;
    &lt;/Window&gt;
  </code></pre>
  
  <p>How do I make this work?</p>