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

[hadley wickham]

> 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"'.

Ooops - the book is now out of date.  Paul Murrell was kind enough to
write a much nicer version called grid.ls - use that instead

Hadley

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