docs: public static boolean isRendered(FacesContext facesContext,
              UIComponent uiComponent)
      {
          // We must call pushComponentToEL here because ValueExpression may have 
          // implicit object "component" used. 
          try
          {
              uiComponent.pushComponentToEL(facesContext, uiComponent);
              return uiComponent.isRendered();
          }
          finally
          {
              uiComponent.popComponentFromEL(facesContext);
          }
      }