dynamic_collections.py example not working in SVN?

I got the example working (svn diff below). Should Collection objects have a set_offsets method?

Index: dynamic_collection.py


--- dynamic_collection.py (revision 5020)
+++ dynamic_collection.py (working copy)
@@ -34,6 +34,8 @@
          color = cm.jet(rand())
+ collection._offsets = offsets
+ collection.set_facecolors(facecolors)
      elif event.key=='d':
          N = len(offsets)
@@ -41,6 +43,8 @@
              ind = random.randint(0,N-1)
+ collection._offsets = offsets
+ collection.set_facecolors(facecolors)

  fig.canvas.mpl_connect('key_press_event', onpress)

I tried to run the dynamic_collections.py example in the source
directory (SVN revision 5002) but got the following error:

Traceback (most recent call last):
File "dynamic_collection.py", line 23, in <module>
transOffset = ax.transData,
TypeError: __init__() got multiple values for keyword argument 'numsides'

I removed the numsides=5 keyword argument (line 16) from
dynamic_collections.py, and while it lets the example run without error,
the "dynamic" aspect doesn't work. That is, the initial plot with a
single point appears but pressing 'a' or 'd' does nothing (when it
should add or delete a point).

Any ideas on how to get this working?