This seems to jam while Chrome is running

chromejam.py

import sys
import wx

print wx.__version__
print sys.version_info

class MyFrame(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title)

class MyMenuApp( wx.App):

    def OnInit(self):
        frame = MyFrame(None, -1, 'No more chrome open')
        sz = wx.BoxSizer()
        p = wx.PopupWindow(frame)
        p.SetSize((100, 100))
        panel = wx.Panel(p)
        print 'now creating the jam button'
        b = wx.Button(panel, label='jam', size=(100, 25)) # <-- THIS HERE IS WHERE WE END UP
        # THIS ALL HAPPENS AFTER THE BADNESS OF THE CHROME
        print 'jam button created'
        szr = wx.BoxSizer(wx.VERTICAL)
        szr.Add(b)
        panel.SetSizer(szr)
        panel.Fit()
        sz.Add(p, 0, wx.GROW|wx.ALL, 5)
        frame.Show(True)
        self.SetTopWindow(frame)
        wx.CallLater(1000, frame.Close)
        return True

print """
Welcome to my little program that will jam until Chrome is closed.

 Setup:
 * Windows 7 - 64 bit
 * wxpython 2.8 ( 2.8.12.1 )
 * python 2.7.2

 So what to do:
 1) Start this script
 2) Play with Chrome (open some tabs and pages)
 3) At some point the script will stop while in "now creating the jam button"
 4) Close chrome
 ==> And things start to go on again
"""

for i in range(1000):
    app = MyMenuApp(0)
    app.MainLoop()
    app.Destroy()
    print i
print 'program ended'