title: Dynamic sort options for SilverShop Module
body: <p>I have been breaking my head on how to do a dynamic sort option, which will show/hide the sort option, depending on whether the category has the "Manufacturer" that the sorter is looking for...</p>
  
  <pre><code>private static $sort_options = array(
      'Alphabetical' =&gt; 'URLSegment',
      'Lowest Price' =&gt; 'BasePrice'
  );
  </code></pre>
  
  <p>Normally the sorter gets its options like this, but this will not seem to cut it for the task at hand.</p>
  
  <p>If anyone can give some tips or ideas of what I can try, that would be really helpful. What am I missing?</p>