Displaying Relations in Protege-OWL Editor

I have created a basic Class hierarchy for my ontology in Protege-OWL Editor version 4.1. But I am not able to visualise Object Properties and relations between the classes in OwlViz other than the normal hierarchy or "is-a" relationship. So please tell me how to display "object properties" using OwlViz or OntoGraf ? or do I need to make some modifications in corresponding owl/xml file ?