title: Use XML child node as label in Spark list itemRenderer
body: <p>In ActionScript, I whittle down my XML to a series of nodes, all formed like this:</p>
  
  <pre><code>&lt;option letter="A"&gt;
      &lt;letter&gt;A&lt;/letter&gt;
      &lt;response&gt;Thank you&lt;/response&gt;
      &lt;posFeed&gt;Excellent&lt;/posFeed&gt;
      &lt;negFeed&gt;Terrible&lt;/negFeed&gt;
      &lt;score&gt;-1&lt;/score&gt;
      &lt;elimOptions&gt;B&lt;/elimOptions&gt;
  &lt;/option&gt;
  </code></pre>
  
  <p>When I set this series as the dataProvider for my Spark list that uses a custom item renderer with a Spark label, I set the label.text={data}, which displays each full set of nodes as a list item.</p>
  
  <p>If I don't want to whittle the XML down to just the  nodes beforehand (I'd like the full set intact for other functions I have to perform), how can I set just the response node to be the data to use for the label in the itemRenderer? I tried setting the label text={data.response}, but that doesn't work (a full set of nodes still appears as each list item.</p>