title: drupal 7: how to access list-field's key instead of its label (field api)
body: <p>I'm working on a custom theme and googled the whole day but can't find an answer to my question:</p>
  
  <p>how to print out a cck list field's key instead of its label?</p>
  
  <p>I think it's the right way to access fields via the field api, right?
  so I try</p>
  
  <pre><code>$output = field_view_field('node', $node, 'field_list');
  print render($output);
  </code></pre>
  
  <p>that seems to be the way to get the label value of the key|label pair. but even if i set the display options format to 'key' - it only prints the label value. what am I doing wrong?</p>
  
  <p>I know there are other options to render the key but how is it possible using field api?</p>