private static boolean isKnown(PsiReference reference) {
    if (reference instanceof JavaFxPropertyReference || reference instanceof JavaFxFieldIdReferenceProvider.JavaFxControllerFieldRef) {
      return true;
    }
    if (reference instanceof JavaFxComponentIdReferenceProvider.JavaFxIdReferenceBase) {
      return ((JavaFxComponentIdReferenceProvider.JavaFxIdReferenceBase)reference).isBuiltIn();
    }
    return false;
  }
private static boolean isKnown(PsiReference reference)