I assume you could do it via reflection.  You'd have to check for the  
implementation of the overloaded operators ("operator<" and "operator>"),  
and then I think you would also need to use reflection to actually use it.

However, there's a pretty good chance that whatever you're trying to do is  
incorrect, if it involves using reflection.  Going down the road to  
reflection is usually a sign that there's something else fundamentally  
broken about the architecture of the code, and that you are trying to  
solve problems that were the code designed better would not have to be  
solved at all.

There are always exceptions to the rule, of course, but it's something you  
should think about.

As far as more specific advice goes, unless you post more specifics about  
what's going on in your code and your design, I think that's about all the  
advice I know to offer.

Pete