[R] ggplot2: specifying legend titles

[Etches Jacob]

I am trying to specify a legend title to be other than the variable  
name, but I find that the legend splits because scale_shape() takes  
effect but scale_colour() does not.  Can someone spot my error?   
Here's some toy code that produces the problem on my system (R2.8.1,  
windows, today's CRAN package updates):

library(ggplot2)
a <- sample(letters[1:5],100,replace=T)
b <- rnorm(100)
c <- rnorm(100)
qplot(b,c,shape=a,colour=a) +
   scale_colour("Better legend title") +
   scale_shape("Better legend title")



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