[R] Lattice: reasons for not passing subscripted "col", "pch", "lty", "fill" to panel functions

[Vitalie Spinu]

Dear UseRs!

I am really amazed by lattice capabilities but one thing is really beyond  
my understanding.
I would like to have conditional plots with points inside each panel  
colored by groups "gr1" and "pched" by "gr2":

xyplot(A~B|C,myD,col=gr1,pch=gr2) #this makes sense for me

But this does not work, because "col","pch","lty","fill" etc. are passed  
directly to panel function and not subscripted by conditional variable C.  
The result is that the same truncated vectors col,pch,lty are used for all  
panels.

I know I can write something like this to overcome the problem:

xyplot(A~B|C,myD,col=gr1,pch=gr2,
        panel=function(x,y,...,subscripts,col,pch){
		 panel.xyplot(x,y,col=col[subscripts],pch=pch[subscripts]
	)
)
but is so clumsy :(.

Isn't it possible to have   panel.XUZ(x,y,...,col=col[subscritps],...) or  
something like that? And dispense whith "groups" variable whatsoever?

Sorry if I missed something.

Many thanks,
Vitalie.