/**
  * Add an export command with specific details. Can be batched.
  * Adds spss file to the export
  * @param string $exportModelSourceName     name of the current export model source
  * @param array $filter                     Model filters for export             
  * @param array $data                       Data submitted by export form
  */
 public function addExport($exportModelName, $filter, $data)
 {
     parent::addExport($exportModelName, $filter, $data);
     if ($model = $this->getModel()) {
         $this->addSpssFile();
         $this->batch->setSessionVariable('files', $this->files);
     }
 }