code: public static void destroyPageFlowStack( HttpServletRequest request )
      {
          ServletContext servletContext = InternalUtils.getServletContext( request );
          PageFlowStack.get( request, servletContext ).destroy( request );
      }
docs: Destroys the stack of {@link PageFlowController}s that have invoked nested page flows.
  
  @deprecated Use {@link PageFlowStack#destroy} instead.
  
  @param request the current HttpServletRequest.