[R] Trellis Plot Labels

[Turgut Durduran]

Hello everyone,

I am ploting a groupeddata object with formula:

formula(mydatausegroup)
BF ~ HO | ID/Infar/Day

Using this command:
plot(na.omit(mydatausegroup), displayLevel=2,layout=c(10,2),aspect=2)


This trellis plot does almost what I want and produces a 10x2 trellis plot, each panel is labeled
as ID/Infar where infarct is either 1 or 0. And in each panel, it plots BF vs HO for each Day. However, the "days" are labeled simply as "1,2,3,4" instead of their actual values (ranging from 1 to 8). This just mapped for each ID the "1 st measurement, 2nd measurement, 3rd measurement, 4th measurement". 

How can I get this trellis plot to use 8 different colors and label them correct?

Thanks,

Turgut