[R] ggplot2: can not find "current.grobTree()"

[xiechao]

Dear All (and Hadley),

Is the function "current.grobTree()" implemented in ggplot2? According to
the draft ggplot2 book, on page 43, we can get a list of all grobs with
current.grobTree(). But when I try that, I get 'Error: could not find
function "current.grobTree"'.

However, when I try help(current.grobTree), I do get a "fake" document.

Best Regards
Xie Chao 
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