code: protected String __internalRender() {
          __internalBuild();
          if (__hasParent()) {
              __parent.__setLayoutContent(toString());
              __parent.addAllLayoutSections(layoutSections);
              __parent.addAllRenderProperties(renderProperties);
              __parent.__setRenderArgs(__renderArgs);
              //__parent.__renderArgs.putAll(__renderArgs);
              return __parent.render();
          } else {
              return toString();
          }
      }
docs: Not to be used in user application or template