[wxPython] Strange Accelerator-behaviour, intercepts A- key

Hi,
while experimenting with menus I came across with the following
strange behaviour. While the following little wx-program is
supposed to call the function OnWhatIsThis when ALT+P is
pressed (which it does) it reacts also on my pressing simply the A-
Key, thus intercepting the char so that the TextCtrl will not show it.
I'm using Windows2000, no service pack, Python2.1 and wxPython
2.3. I am somewhat confused, seems to be a kind of bug...
Thanks
Christoph

···

#-----------------------------------------------------------------
from wxPython.wx import *

ID_WHATISTHIS = 101

class MyFrame(wxFrame):
    def __init__(self, parent, ID, title):
        wxFrame.__init__(self, parent, ID, title,
                         wxDefaultPosition, wxSize(200, 150))

        menu = wxMenu()
        menu.Append(ID_WHATISTHIS, "&Strange behaviour\tControl-
A")

        menuBar = wxMenuBar()
        menuBar.Append(menu, "&File");
        self.SetMenuBar(menuBar)

        t = wxTextCtrl(self, -1, "Test", wxDefaultPosition,
wxDefaultSize)

        # set the menu accelerator table:
        AT = wxAcceleratorTable([(wxACCEL_ALT, ord('P'),
ID_WHATISTHIS)])
        self.SetAcceleratorTable(AT)

        EVT_MENU(self, ID_WHATISTHIS, self.OnWhatIsThis)
        
    def OnWhatIsThis(self, evt):
        print "On What Is This"

class MyApp(wxApp):
    def OnInit(self):
        frame = MyFrame(NULL, -1, "Hello from wxPython")
        frame.Show(true)
        self.SetTopWindow(frame)
        return true

app = MyApp(0)
app.MainLoop()
#--------------------------------------------------------