Changing edit form based on user credentials

Hi all, I've got a class inherited from PRPage with some additional properties, and I want to hide those properties from all but the page owner at edit time. The problem is that PREditCommand doesn't pass the context to the page before requesting its description, so the page instance doesn't have the necessary information to dynamically change its description. I can get the required functionality to work, by overriding PREditCommand>>description to make decisions about how to render the page, but that seems I wonder if there's a better way to approach this? In other words, is there a sensible way to make PRPage aware of the context in which its edit form is being rendered? I was contemplating adding context as an instance variable on PRPage and setting it from PREditCommand, but I suspect that if that was a sensible approach, it would have been done already! I've only just started using Pier in earnest, so if this question exposes a lack of understanding of anything fundamental, please feel free to point this out. Cheers, Michael