How does `ggplotGrob` work? : <p><a href="http://docs.ggplot2.org/0.9.3/ggplotGrob.html">docs.ggplot2.org</a> currently offers very little documentation for the function <code>ggplotGrob</code>. The <a href="http://svitsrv25.epfl.ch/R-doc/library/ggplot2/html/ggplotGrob-1l.html">EPFL website</a> is a little bit more informative but it is still not very helpful.</p>

<p>Can you please provide a short tutorial on what one can do with the function <code>ggplotGrob</code>?</p>
