@Override
    public @Nullable String validateValue(XmlElement context, String value) {
      final PsiReference[] references = context.getReferences();
      if (references.length == 0 || references[references.length - 1].resolve() == null) {
        return JavaFXBundle.message("javafx.root.tag.descriptor.cannot.resolve.class", value);
      }
      return null;
    }
@Override
    public @Nullable String validateValue(XmlElement context, String value)