title: Grouping dynamic datatable columns in primefaces 3.5
body: <p>Say I have a <code>&lt;p:datatable&gt;</code> with 2 static columns and a list of dynamic columns. How can I add a header over the dynamic columns only?<br>
  To be more specific, here is how it must look:  </p>
  
  <pre><code>-------------------------------------------------------------------------
  |               |               |         Header over dynamic columns   |
  | StaticColumn1 | StaticColumn2 |----------------------------------------
  |               |               | DynamicCol1 | DynamicCol2 | ........  |
  -------------------------------------------------------------------------
  |               |               |             |             |           |
  -------------------------------------------------------------------------
  |               |               |             |             |           |
  -------------------------------------------------------------------------
  </code></pre>
  
  <p>I've already tried with  <code>&lt;p:columnGroup&gt;</code> but it seems that it doesn't support <code>&lt;p:columns&gt;</code>.<br>
  Thanks in advance.</p>