Problema con combobox

[IamEdo]

talvez asi se entienda mejor
la idea es poder cambiar las imagenes de los botones, pero solo logro mostrar las imagenes sueltas y no acomodadas en la grilla

Código Python:

import wx
class MyFrame(wx.Frame):
    
    cmbox=1
    def __init__(self, *args, **kargs):
        wx.Frame.__init__(self, *args, **kargs)
        
        topsizer = wx.BoxSizer( wx.HORIZONTAL )
        menusizer = wx.BoxSizer( wx.VERTICAL )
        contentsizer = wx.BoxSizer( wx.VERTICAL )
        
        self.asdf = wx.GridBagSizer()
  
        
        self.picture = wx.StaticBitmap(self)
        
        imageFile = "images/%d.jpeg"%(self.cmbox)
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n1 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/2.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n2 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/3.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n3 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/4.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n4 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/5.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n5 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/6.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n6 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/7.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n7 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/8.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n8 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        imageFile = "images/9.jpeg"
        image1 = wx.Image(imageFile, wx.BITMAP_TYPE_ANY).ConvertToBitmap()
        n9 = wx.BitmapButton(self, -1, bitmap=image1,size = (image1.GetWidth()-30, image1.GetHeight()-30))
        
        sampleList = ['uno', 'dos', 'tres', 'cuatro']
 
        combo1 = wx.ComboBox(self, 500, "elementos", (90, 80), 
                         (350, -1), sampleList,
                         wx.CB_DROPDOWN
                         )
 
        self.Bind(wx.EVT_COMBOBOX, self.EvtComboBox, combo1)
       
        self.asdf.Add(n1, (13, 1))
        self.asdf.Add(n2, (13, 2))
        self.asdf.Add(n3, (13, 3))
        self.asdf.Add(n4, (14, 1))
        self.asdf.Add(n5, (14, 2))
        self.asdf.Add(n6, (14, 3))
        self.asdf.Add(n7, (15, 1))
        self.asdf.Add(n8, (15, 2))
        self.asdf.Add(n9, (15, 3))
        
 
        menusizer.Add(self.asdf, 0)
        topsizer.Add(menusizer, 0)
        self.SetSizer(topsizer)
        
    def EvtComboBox(self, evt):
        
        print "estoy en el evento"
        if evt.GetString() == 'uno':
            self.cmbox = 1;
        if evt.GetString() == 'dos':
            self.cmbox = 2;
        if evt.GetString() == 'tres':
            self.cmbox = 3;
        if evt.GetString() == 'cuatro':
            self.cmbox = 4;
        self.picture.SetBitmap(wx.Bitmap('images/%d.jpeg'%self.cmbox))
        print self.cmbox
        
app = wx.App()
frame = MyFrame(None, title="asdf")
frame.Show(True)
app.MainLoop()
 

alguna idea???
saludos