[BioC] RGList/MAList--extending subsetting behavior

[Sean Davis]

I have found the MA and RG object and extremely intuitive way of 
passing around microarray information.  However, I am now getting 
involved with other analyses besides expression and would like to store 
more information (such as a dataframe of "smoothed" data), but retain 
the subsetting, ordering, etc. behavior of the MA/RG objects 
(LargeObjects, if I recall).  I can see that [.RGList is probably how 
this action is defined, but how to see what [.RGList is or how I can 
modify it remains elusive.  Any concrete help?

Thanks,
Sean