How to programmatically determine the entities that appear on the CRM Security Roles editor UI?

Hi

I am designing a different interface to show the Roles / Privileges for the entities. 

But, when I programmatically fetch the entities, I get lot more than what I see on the CRM Security Roles editor UI. 

How do I determine, which all entities are shown in the UI for configuration and which all entities are hidden? 

Example: Address and Agency Entities.  Here Address is hidden and Agency is shown.  How do I determine this factor programmatically?

Thanks, Rajeev