Python Label problemmer

Hej Eksperter

Jeg har et lille problem med mine python kode.
Når jeg starter med et vindue1 og starter vindue2 så kommer labelen fra vindue2 frem på vindue1. Hvad gør jeg forkerte ?

Kode på vindu1:
#!/usr/bin/env python

import Tkinter
import classvindue2

class vindue1(Tkinter.Tk):

  MyWidth = 370
  MyHeight = 170
  myTitel = 'vindue1'

  def __init__(self, parent):
    Tkinter.Tk.__init__(self,parent)
    self.parent = parent
    reload(classvindue2)
    self.gui()

  def gui(self):
    self.config(width=self.MyWidth,height=self.MyHeight)
    self.selfcenter()
    self.title(self.myTitel)
    button = Tkinter.Button(self,text = "Start 2. vindue", command = self.OnVindueClick);
    button.place(x=30,y=20,width=120,height=20)
    w2 = Tkinter.Label(text = "Test Label",relief='solid')
    w2.place(x=30,y=55,width=120,height=20)

   
  def selfcenter(self):
    self.update_idletasks()
    sw = self.winfo_screenwidth()
    sh = self.winfo_screenheight()
    w = self.winfo_reqwidth()
    h = self.winfo_reqheight()
    newGeometry='+%d+%d' % ((sw/2)-(w/2), (sh/2)-(h/2))
    self.geometry(newGeometry=newGeometry)

  def OnVindueClick(self):
    app = classvindue2.vindue2(None)
    app.mainloop()

   
if __name__ == "__main__":
  mainapp = vindue1(None)
  mainapp.mainloop(0)
   
Kode på vindue2:
#!/usr/bin/env python
# -*- coding: utf-8 -*-

import Tkinter
import tkFont

class vindue2(Tkinter.Tk):
  MyWidth = 370
  MyHeight = 170
  myTitel = 'Vindue2'

  def __init__(self,parent):
    Tkinter.Tk.__init__(self,parent)
    self.parent = parent
    self._gui_()

  def centerx(self,xwidth):
    return (self.MyWidth/2) - (xwidth/2)
       
  def getFontsize(self, cFont, sstr): #return (w,h)
    return (cFont.measure(sstr),cFont.metrics("linespace"))
           
               
  def selfcenter(self):
    self.update_idletasks()
    sw = self.winfo_screenwidth()
    sh = self.winfo_screenheight()
    w = self.winfo_reqwidth()
    h = self.winfo_reqheight()
    newGeometry='+%d+%d' % ((sw/2)-(w/2), (sh/2)-(h/2))
    self.geometry(newGeometry=newGeometry)

  def _gui_(self):
    self.customFont = tkFont.Font(size=36)
    sstr = u"Test"
    (w,h) = self.getFontsize(self.customFont,sstr)
    w1 = Tkinter.Label(text = sstr,font=self.customFont,relief='solid')
    w1.place(x=self.centerx(w),y=15,width=w+2,height=h+2)
    self.config(width=self.MyWidth,height=self.MyHeight)
    self.title(self.myTitel)
    self.selfcenter()

if __name__ == "__main__":
  appmain = vindue2(None)
  appmain.mainloop(0)