code: private void updateGroupValidation() {
  
          boolean hasError = false;
          for (I_CmsEditableGroupRow row : getRows()) {
              if (hasError(row.getComponent())) {
                  hasError = true;
                  break;
              }
          }
          setErrorVisible(hasError);
      }
docs: Updates the visibility of the error label based on errors in the group components.<p>