title: How do I configure the behavior of the Qt4Agg backend?
body: <p><a href="https://stackoverflow.com/questions/6019776/matplotlib-figures-disappearing-between-show-and-savefig">In an earlier question</a> I learned that the behavior on <code>show()</code> was dependent on the <a href="http://matplotlib.sourceforge.net/faq/installing_faq.html#backends" rel="nofollow noreferrer">backend</a> in use by matplotlib.  At that time I was looking for a way to keep <code>show()</code> from deleting the drawing elements of a figure, concluding that by switching from Qt4Agg to TkAgg, the drawing elements would be preserved even if the figures were closed.  I would like to increase my superpowers by learning, if possible, how to configure the Qt4agg backend to behave as desired.</p>