wxPython EVT_CHAR not called when a panel is added to a frame

wxPython EVT_CHAR not called when a panel is added to a frame

I need to bind the EVT_CHAR event for a GUI application I am developing
using wxPython. I tried the following and I cann understand the beahviour
of the code.
import wx
import wx.lib.agw.flatnotebook as fnb
class DemoApp(wx.App):
def __init__(self):
wx.App.__init__(self, redirect=False)
self.mainFrame = DemoFrame()
self.mainFrame.Show()
def OnInit(self):
return True
class DemoFrame(wx.Frame):
def __init__(self):
"""Constructor"""
wx.Frame.__init__(self, None, wx.ID_ANY,
"FlatNotebook Tutorial",
size=(600,400)
)
panel = wx.Panel(self)
button = wx.Button(panel, label="Close", pos=(125, 10), size=(50,
50))
self.Bind(wx.EVT_CHAR, self.character)
def character(self, event):
print "Char keycode : {0}".format(event.GetKeyCode())
if __name__ == "__main__":
app = DemoApp()
app.MainLoop()
The character function never gets called. However, when I comment out the
two lines call to the Frame constructor, I character function is called.
Adding a panel to the frame seems to interfere with the binding of the
frame's EVT_CHAR.
How do I address this problem? Am I doing something wrong in my code?