[R] treemap grouping

[evgeny55]

Hi, 
Is there a way to create a treemap with more than 1 grouping.  I've seen a
lot of examples like this:
http://flowingdata.com/2010/02/11/an-easy-way-to-make-a-treemap/ but what if
some of my categories have sub-categories.  Is there an existing function
that can handle this 

thanks 
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