title: Default sort column in rich:datatable
body: <p>I have rich:dataTable with multiple sortable columns.</p>
  <pre><code>&lt;rich:column sortBy=&quot;#{user.uid}&quot;&gt;
  ...
  &lt;rich:column sortBy=&quot;#{user.sn}&quot;&gt;
  ...
  etc.
  </code></pre>
  <p>Sorting works fine. However, when page is loaded, table is always sorted by 1st column. How can I set &quot;default&quot; sorting column? (for example, the one with user.sn)</p>
  <p>Edit: I wanted it sorted by <code>sn</code> first, <code>uid</code> second.</p>