Why won't this terminate?

#!/usr/bin/python3
from circuits import Component, Event, Debugger
from libs import t1tbEvents
import curses

class App(Component):
    ticks=0
    running=True
    max_ticks=20

    def __init__(self):
        super(App, self).__init__()

    def Hello(self):
        """Hello Event Handler"""

        print("Hello World!")

    def Tick(self):
        """Tick Event Handler"""
        if self.running:
             if self.ticks <= self.max_ticks:
                 print("TICK", self.ticks)
                 self.ticks+=1
                 self.fire(t1tbEvents.Tick())
             else:
                 self.running=False
        else:
             self.fire(t1tbEvents.Terminate())


    def Terminate(self):
        raise SystemExit(0)
    def started(self, *args):
        self.register(self)
        #Debugger.register(self)
        self.fire(t1tbEvents.Tick())


App().run()