title: jQuery DataTables fixedColumns remove fixed columns dynamically
body: <p>I'm using <a href="http://datatables.net/extensions/fixedcolumns/" rel="nofollow">fixedColumns</a> plugin for my <a href="http://www.datatables.net/reference/" rel="nofollow">DataTables</a> component. And I want to allow users to toggle fixed columns from the table header.</p>
  
  <p>Creating the fixed columns is straign forward:</p>
  
  <pre><code>this.table.fixedColumns = new $.fn.dataTable.FixedColumns(this.table, {
      iLeftColumns: index + 1
  });
  </code></pre>
  
  <p>I wonder, how can I change the fixedColumns created, or if I can't, that seems like the case, cause I tried updating <code>iLeftColumns</code> option and doing <code>fnUpdate</code> but had no effect:</p>
  
  <pre><code>this.table.fixedColumns.s.iLeftColumns = 0;
  this.table.fixedColumns.fnUpdate();
  </code></pre>