/** Show the types which are available in the current project only. */
  protected void refreshFromProject() {

    if (fTreeViewer != null) {
      fTreeViewer.setInput(null);
    }

    if (fProjectObjects == null) {
      Resource resource = modelObject.eResource();
      IFile file = BPELUtil.getFileFromURI(resource.getURI());
      fProjectObjects = resourceContentProvider.getElements(file.getProject());
    }

    if (fFilteredList != null) {

      fFilteredList.setEnabled(true);
      fFilteredList.setAllowDuplicates(showDuplicates);
      fFilteredList.setElements(contentProvider.getElements(fProjectObjects));

      if (contentProvider.getElements(fProjectObjects) != null
          && contentProvider.getElements(fProjectObjects).length > 0) {
        updateLowerViewWidget(fFilteredList.getSelection());
      }
    }
  }