ContextEvents and Tkinter

[cuso]

I have one problem with the following code:

from win32com.client import constants
import win32com.client
import win32gui
import pythoncom
from Tkinter import *
 
class SpeechRecognition:
        def __init__(self, wordsToAdd):
        self.speaker = win32com.client.Dispatch("SAPI.SpVoice")
        self.listener = win32com.client.Dispatch("SAPI.SpSharedRecognizer")
        self.context = self.listener.CreateRecoContext()
        self.grammar = self.context.CreateGrammar()
        self.grammar.DictationSetState(0)
        self.wordsRule = self.grammar.Rules.Add("wordsRule",constants.SRATopLevel + constants.SRADynamic, 0)
        self.wordsRule.Clear()
        [ self.wordsRule.InitialState.AddWordTransition(None, word) for word in wordsToAdd ]
        self.grammar.Rules.Commit()
        self.grammar.CmdSetRuleState("wordsRule", 1)
        self.grammar.Rules.Commit()
        self.eventHandler = ContextEvents(self.context)
    def say(self, phrase):
        self.speaker.Speak(phrase)
 
class ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")):
    def OnRecognition(self, StreamNumber, StreamPosition, RecognitionType, Result):
        newResult = win32com.client.Dispatch(Result)
        globals()['fraza']=newResult.PhraseInfo.GetText()
        print "You said: ",fraza
        if fraza=='winamp':
            speechReco.say("What")
            graf.list1.delete(0,END)
            graf.list1.insert(END,fraza)
 
class App:
 
    def __init__(self, master):
        self.list1=Listbox(master,bg='pink',width='20',height='1',font=("Comic Sans MS",14))
        self.list1.pack(anchor=W)
        self.list1.insert(0,'Hey')
 
 
if __name__=='__main__':
    globals()['fraza']=1
    wordsToAdd = ['winamp','play']
    speechReco = SpeechRecognition(wordsToAdd)
    root=Tk()
    graf=App(root)
    root.mainloop()
 

Problem is with these 2 lines (41,42):
graf.list1.delete(0,END)
graf.list1.insert(END,fraza)
because program stops and is not responding any more when it come to this lines. If these two lines are not in class ContextEvents, the program works fine but i need them in there. Even if I call function with this two lines from ContextEvents the program freeze.

The program must delete text and insert text 'winamp' in Tkinter Label when i say winamp in microfone. Everything works fine but when i say 'winamp' program freeze. How can i solve this problem. Please help.