custom events within classes

[Penguin]

Hi, is it possible to register more than one function for listing on a custom event? When pressing the 'e'-button the following code should print out 'B' and 'C'. But only 'C' is printed out. When I swap the two *.enableEvent(EVENT) lines then 'B' is printed out.

Therefore I guess only one function can listen to an event at the same time. Am I right?

import viz

class A(object):
	def __init__(self):
		pass
	
	def enableEvent(self, EventID):
		viz.callback(EventID,self.doit)
		
	def doit(self):
		pass
		
class B(A):
	def __init__(self):
		pass
		
	def doit(self):
		print "B"
		
class C(A):
	def __init__(self):
		pass
		
	def doit(self):
		print "C"

viz.go()

EVENT = viz.getEventID('EVENT')

b = B()
b.enableEvent(EVENT)
c = C()
c.enableEvent(EVENT)


def sendEvent():
	viz.sendEvent(EVENT)

vizact.onkeydown('e',sendEvent)