EventFilter Example Fails

I tried a simplified version of the event filter example found
at http://wxpython.org/Phoenix/docs/html/EventFilter.html

class KeyEventFilter(wx.EventFilter):
    def __init__(self):
        wx.EventFilter.__init__(self)
        wx.EvtHandler.AddFilter(self)

    def __del__(self):
        wx.EvtHandler.RemoveFilter(self)

    def FilterEvent(self, event):
        t = event.GetEventType()
        if t == wx.EVT_KEY_DOWN:
            print "key down"
        event.Skip()

When I try to instantiate the class

        filter = KeyEventFilter()

I get the following error message:

TypeError: wx._core.EventFilter cannot be instantiated or sub-classed

Is this example know to work?

Thanks,

Eric Nystrom

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