Can't override OnCreateStatusBar for wxFrame

[Larry Bates]

I wanted to create a custom status for my frame but I couldn't get it to work. 
I've stripped it down to the code below.  Docs say if you override 
OnCreateStatusBar method of wx.Frame it will get called and you can return your 
custom status bar instance.  Am I doing something wrong, or is this a bug?

Thanks in advance.
Larry


import wx
import time

class CustomStatusBar(wx.StatusBar):
     def __init__(self, parent):
         wx.StatusBar.__init__(self, parent, -1)
         self.SetFieldsCount(2)
         print "CustomStatusBar, setting StatusWidths"
         self.SetStatusWidths([570, 70])

class TestFrame(wx.Frame):
     def __init__(self):
         wx.Frame.__init__(self, None, -1)
         self.SetSize((640, 480))
         self.CreateStatusBar(1)
         b = wx.Button(self, -1, "Start demo", (50,50))
         self.Bind(wx.EVT_BUTTON, self.demo, b)

     def demo(self, event):
         CSB=self.GetStatusBar()
         for i in xrange(20):
             print "setting value=%i" % (i+1)
             CSB.SetStatusText("%i" % (i+1), 1)
             time.sleep(.2)

     def OnCreateStatusBar(self, *args, **kwds):
         print "OnCreateStatusBar-Entering"
         return CustomStatusBar(self)


if __name__ == "__main__":
     app = wx.App(0)
     f = TestFrame()
     f.Show()
     app.MainLoop()