title: How do you add a scroll bar to an expander panel?
body: <p>I have a stack panel inside of an expander panel that I programaticaly adds check boxes to.  Currently the exanpander stops at the bottom of the form, but the stack panel keeps growing.  I would like the stack panel to be bounded by the expander and scroll to display the check boxes.  Do I need house the check boxes in a list box to get the scroll functionality?</p>
  
  <pre><code>&lt;Grid&gt;
      &lt;Expander Header="Expander1"  Margin="0,0,0,2" Name="Expander1" VerticalAlignment="Top" Background="Coral"&gt;
          &lt;StackPanel Name="StackScroll" Margin="0,0,0,2"  Background="Aqua"&gt;&lt;/StackPanel&gt;
      &lt;/Expander&gt;
  &lt;/Grid&gt;
  </code></pre>
  
  <p>");</p>