code: @Override
      protected void doPerform() {
          if (isSourceDocumentRoot()) {
              getActions().doubleClick().perform();
          } else {
              getActions().doubleClick(getFirstElement()).perform();
          }
      }
docs: /*
  (non-Javadoc)
  
  @see com.vilt.minium.actions.DefaultInteraction#doPerform()