agw.aui LoadPerspective problem

In my program, I write the following 2 methods to add/remove the
notebook's pages.

	def  AddPanel(self, panel):
		self._mainNotebook.AddPage(panel, panel.GetLabel(), False)
		panel.Show()
		self._mainNotebook.Update()

	def RemovePanel(self, idx):
		page = self._mainNotebook.GetPage(idx)
		page.Hide()
		self._mainNotebook.RemovePage(idx)
		self._mainNotebook.Update()

When the program started, I create many panels and call 'AddPanel' to
add all panels to the notebook.
Then I call 'RemovePanel' to hide one(Le'ts call it panelA) and call
notebook's 'SavePerspective', and exit the program.

When I start the program again, call notebook's 'LoadPerspective',
everything is OK. The panelA is not in the notebook also.

But, when I called:
self._mainNotebook.GetPageIndex(panelA):
The return value is not wx.NOT_FOUND.

Is this a bug?

Thank you

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