@Nullable
  static EnumerationChildrenRenderer getParentEnumerationRenderer(ValueDescriptorImpl descriptor) {
    if (descriptor instanceof UserExpressionDescriptorImpl) {
      return EnumerationChildrenRenderer.getCurrent(((UserExpressionDescriptorImpl)descriptor).getParentDescriptor());
    }
    return null;
  }
@Nullable
  static EnumerationChildrenRenderer getParentEnumerationRenderer(ValueDescriptorImpl descriptor)