title: Access values of a list widget
body: <p><a href="http://www.videolan.org/developers/vlc/share/lua/README.txt" rel="nofollow">VLC dev lua readme</a> documents the api for creating a list widget and adding values to it:</p>
  
  <pre><code>d:add_list( ... )
  w:add_value( text, id )
  </code></pre>
  
  <p>How can I iterate over added values (i.e. all values available to be selected, <em>not</em> the current list widget selection)?</p>