private void showExternalDownloadItems() {
   final Map<String, FcpPersistentGet> items = persistentQueue.getDownloadRequests();
   for (final FcpPersistentGet downloadRequest : items.values()) {
     if (!downloadModelItems.containsKey(downloadRequest.getIdentifier())) {
       addExternalItem(downloadRequest);
     }
   }
 }