Sync Class Diagram based on object diagram

Anyone knows how to update class diagram based on object diagram in visual paradigm? We are updating object diagrams and would like to see the same change in affect in class diagram without updating them manualy. I can do the other way around by going to Top navigation -> Tools -> Object-Relational Mapping(ORM)-> Synchronize to Entity Relationship Diagram. But, Synchronize to Class Diagram option is greyed out.