If a subclass of wx.GridBagSizer is added to another sizer, it loses 
all references to all of its subclass information, and acts like a base 
class wx.GridBagSizer. Subclasses of wx.BoxSizer do not display this 
problem; they work as expected.

	I've created a small test application that demonstrates this problem 
(code below my sig). I first noticed it when working with some Dabo 
sizer subclasses, and thought it might be something in our code. But 
this is pure wxPython-only code, and it shows the same behavior.

	I've run this code on wxPython 2.5.2.8/OS X and 2.5.2.7/Win 2K; both 
are running Python 2.3.3.

      ___/
     /
    __/
   /
  ____/
  Ed Leafe
  http://leafe.com/
  http://dabodev.com/


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import wx

class xSizer(wx.BoxSizer):
	CustomAttribute = 42

class xGridSizer(wx.GridBagSizer):
	CustomAttribute = 42

class SizerFrame(wx.Frame):
	def __init__(self, parent, id, title):
		super(SizerFrame, self).__init__(parent, id, title)
		btnID = wx.NewId()
		btn = wx.Button(self, btnID, "Run Test")
		self.Bind(wx.EVT_BUTTON, self.test)
		
	def test(self, evt):
		sz = wx.BoxSizer(wx.VERTICAL)
		self.SetSizer(sz)
		print "-" * 66
		print "Form's sizer:", sz
		print
		
		grdSz = xGridSizer()
		print "Grid Sizer:", grdSz
		print "Grid Sizer class:", grdSz.__class__
		print "Grid Sizer Attribute:", hasattr(grdSz,"CustomAttribute")
		print
		
		boxSz = xSizer()
		print "Box Sizer:", boxSz
		print "Box Sizer class:", boxSz.__class__
		print "Box Sizer Attribute:", hasattr(boxSz,"CustomAttribute")
		print
		
		sz.Add(grdSz)
		sz.Add(boxSz)
		szChildren = sz.GetChildren()
		# There are only two children, the grid sizer
		# and the box sizer
		childGridSz = szChildren[0].GetSizer()
		childBoxSz = szChildren[1].GetSizer()
		
		print "Child grid sizer:", childGridSz
		print "Child grid class:", childGridSz.__class__
		print "Child grid Attribute:", hasattr(childGridSz, "CustomAttribute")
		print
		
		print "Child box sizer:", childBoxSz		
		print "Child box class:", childBoxSz.__class__
		print "Child box Attribute:", hasattr(childBoxSz, "CustomAttribute")
		print "-" * 66

		self.Destroy()

def main():
	app = wx.PySimpleApp()
	frame = SizerFrame(None, -1, "Sizer Test")
	frame.Show(1)
	app.MainLoop()
	
if __name__ == "__main__":
	main()
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