I'm totally confused, why would DevX be talking to our filter property?
Mike, CodeRush/Refactor Pro has made some real improvements. One of them is its ability to follow/trace code througout your solution and make meaningful "suggestions" or highlight potential maintenance issues. That error indicates that CR/R! cannot find within the chain the implementation and is suggesting that the code might err if the memeber is called. Sometimes CR/R! does not have access to the entire chain and its warning is false (I.e. a seperate assembly not referenced).
There are many other helpful features and when I look at the output of generated files with it there are many not-so-big-deal suggestions like the "this." portion of code is redundant and not needed, or when using .NET 3.5 and above you can just call a delegate directly (I.e. the method).
There are also suggestions that could potentially help with memory usage and performance. For example, several methods are being identified as "could make member static". That could save memory and with high volumes improve performance.
Anyway, its been beyond useful for me and it does a very nice job of looking for potential errors or areas of potential improvement.