Background color(s) for groupedData plot

"Paul," == Paul, David A <paulda at battelle.org> writes:

> Is there a convenient way to decide whether or not the
    > generic plot( ) is going to use "regular" or "trellis"
    > plotting?  I looked at methods(plot) and didn't find any
    > groupedData plot methods listed, so perhaps this is the
    > clue?

It's there, but as the GroupedData methods, not groupedData.

require(nlme)
methods(plot)[grep('groupedData',methods(plot),ignore.case=T)]

[1] "plot.nffGroupedData" "plot.nfnGroupedData" "plot.nmGroupedData" 

Mike