@Override
  public void modifyTestElement(TestElement te) {
    StockParam sampler = (StockParam) te;
    sampler.clear();
    configureTestElement(sampler);

    super.modifyTestElement(sampler);

    sampler.setHeaders((Arguments) headers.createTestElement());
  }
 private void configureHeaders(StockParam sampler) {
   Arguments sampleHeaders = sampler.getHeaders();
   if (sampleHeaders != null) {
     headers.configure(sampleHeaders);
   } else {
     headers.clearGui();
   }
 }