wxNotebook on a wxPanel.. how?

[phark52 at yahoo.com]

I have a wxFrame. On it is a wxNotebook, the Notebook ctrl has 5 tabs
(Each one is a wxPanel.) On one of the tab pages (panels) I want to add
another notebook ctrl. I get no errors but nothing shows up on the
panel.. why is that? If I add a button or checkbox to the sizer on that
panel, it shows. A notebook ctrl just isn't visible. The code is below:

I checked and AddPage() returns True
Weird thing is I can see a little bit, like the corner of a button
where the wxNotebook is supposed to start.

class TabPage(wxPanel):
	def __init__(self, parent):
		wxPanel.__init__(self, parent, -1)

		self.nb = wxNotebook(self, -1)
		self.nb.AddPage(wxPanel(self.nb, -1), "Settings")

		sizer = wxBoxSizer(wxHORIZONTAL)
		sizer.Add(self.nb(self))
		self.SetSizer(sizer) 
		self.Layout() 
		self.Fit()