/**
  * Update ui after job finished.
  *
  * @param action
  * @param job
  * @param event
  */
 private void updateInstalledUI(
     final ShowInstalledExtensionsJob showInstalledJob, final IJobChangeEvent event) {
   if (event.getResult().isOK()) {
     // update exchange view
     List<ComponentExtension> extensions = showInstalledJob.getfInstalledExtensions();
     ExchangeManager.getInstance().updateInstalledExtensions(extensions);
   }
 }