[R] Auto key legend does not match plot

[markm0705]

Dear R-help members.  I am an 'R-learner' (about 6 hours so far) using the
lattice library to create a ranked dotplot and am colour coding the dots by
a variable called "Commodity".  However when i use autokey to make a legend
the size (cex) and symbol (pch) do not match what is on the dotplot.  
Code is below and image attached 

library("lattice")
Cal_dat <- read.table("Calibration2.dat",header = TRUE,sep = "\t",)
dotplot(reorder(Label.yr, Resc_Gt)~ Resc_Gt,groups=Commodity,
	data=Cal_dat,cex=1.5, pch=19,aspect="xy",
	auto.key=list(space="right",title="Commodity")) 

Any assistance appreciated
http://r.789695.n4.nabble.com/file/n3756245/Ranked_boxplot_by_commodity.png 

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