wxPython color does not change

[HiHe]

Method onPaint does not change the color. Does anyone know why?
(there are no errors received)

# explore the wxChoice widget
# a simple ComboBox (dropdown box) that combines a ListBox with an EditBox
# can't get the self.onPaint method to work!!!!!

import wx

ID_CHOICE = 120
ID_PANEL = 130

class MyFrame(wx.Frame):
    def __init__(self ):
        wx.Frame.__init__(self, None, -1, 'wxChoice test', size=(250, 200))
        self.panel = wx.Panel(self, ID_PANEL)
        colorList = ['red', 'green', 'blue', 'yellow','white']
        # create the dropdown box
        self.choice = wx.Choice(self.panel, ID_CHOICE, choices=colorList)
        # select item 1 = 'green' to show
        self.choice.SetSelection(1)
        self.bgcolor = self.choice.GetStringSelection()
        self.panel.SetBackgroundColour(self.bgcolor)

        # new event handler wxPython version 2.5 and higher
        self.choice.Bind(wx.EVT_CHOICE, self.onChoice)

        self.Bind(wx.EVT_PAINT, self.onPaint)

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.Add(self.choice, 0)
        self.panel.SetSizerAndFit(self.sizer)

    def onChoice(self, event):
        '''get the selected color choice'''
        self.bgcolor = self.choice.GetStringSelection()
        self.SetTitle(self.bgcolor)

    def onPaint(self, event):
        '''update panel with the present color selection'''
        self.panel.ClearBackground()
        self.panel.SetBackgroundColour(self.bgcolor)
        #self.panel.ClearBackground()


app = wx.App(0)
# create MyFrame instance and show
MyFrame().Show()
app.MainLoop()

[HiHe]

[IMG]http://i48.tinypic.com/w6sjn6.jpg[/IMG]