title: C1 Print Preview Dialog disable some save to file options
body: <p>I am using <code>C1PrintPreviewDialog</code></p>
  
  <p>Is it possible to disable some of the save to file options – for example <code>xls</code> and <code>xlsx</code> exports are not working for me so I would like to hide them from end user until problem is resolved. </p>
  
  <p>Thanks</p>