[R] boxplot - how to supress groups with low counts

[pdb]

In a boxplot - how can I prevent groups where the number of cases is less
than a set threshold from being plotted.

set.seed(42)
 DF <- data.frame(type=sample(LETTERS[1:5], 100, replace=TRUE),
cost=rnorm(100)) 
 count <- boxplot(cost ~ type, data=DF, plot = 0) 
 count$n

## how to only include plots where count$n > 18   
 boxplot(cost ~ type, data=DF)   

Thanks in advance for any solutions.
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