/**
  * Creates a dropdown for selection of folders for choosing an existing file
  *
  * @return DropdownField
  */
 public function ImportDropdown()
 {
     $d = new SimpleTreeDropdownField("ImportFolderID_{$this->id()}", _t('Uploadify.CHOOSEIMPORTFOLDER', 'Choose a folder'), "Folder", null, "Filename");
     $d->setEmptyString('-- ' . _t('Uploadify.PLEASESELECT', 'Select a folder') . ' --');
     $d->addExtraClass("{'url' : '" . $this->Link('importlist') . "' }");
     return $d;
 }