The problem with the CR object model is that it doesn't have access to real-time data. It gives you the properties of the object model prior to processing the report. Thus, you can't find out what is being printed while the report is running. I mentioned this problem to them a while back and they said it is by design to improve scalability of enterprise level reports. Thus, once the report runs it triggers as few events as possible to keep the load time for each page view at a minimum.