[R] Lattice: vertical barchart

[Michael Hoffman]

barchart(Titanic, stack=F) produces a very nice horizontal barchart. 
Each panel has four groups of two bars.

barchart(Titanic, stack=F, horizontal=F) doesn't produce the results I 
would have expected, as it produces this warning message:

Warning message:
y should be numeric in: bwplot.formula(x = as.formula(form), data = 
list(Class = c(1,

And it results in each panel having 22 groups of 0-2 bars.

How can I produce something just like the original except with the 
orientation changed?

Thanks in advance.