[pox-dev] Listeners in class

[Amer]

Hello,

I would like to add listeners to flow and port status in l3.learning.py.
There is a command 
Self.listento(core)
But it is not calling flow or port status function
I tried with self.addListenersByname("flowstatereceived", 
self._handle_flowstate_received)
and without self

But it is not work

Best regards,
Amer