Here are some imports: 

# PyQt4 modules 
from PyQt4.QtCore import * 
from PyQt4.QtGui  import * 

# matplotlib modules 
import matplotlib.patches as mpathes 
import matplotlib.text as mtext 
import matplotlib.lines as mlines 
from matplotlib.path import Path 
from matplotlib.collections import LineCollection 

from matplotlib.figure import Figure 
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas 
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as
NavigationToolbar 

And this: 
matplotlib.__version__ => 0.99.1.1 

I am afraid I may not be able to run a rather minimal app right away since
this is somebody else's Qt app, pretty large, that I am trying to add some
plotting...I will see if I can get start another minimal Qt app... 

For now, there isn't much of a problem with the application, it is just that
I inspect the mouseevent from within the picker function and I get this 

None 
1 
<matplotlib.collections.LineCollection object at 0x132fa0d0> 

where 
None is the key 
1 is the mouse button pressed 
and the rest is the artist 
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