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Validator - Nei controlli TextCtrl ho realizzato un validator ma i tasti freccia non funzionano

Nei controlli TextCtrl ho realizzato un validator, che allego,  ma i
tasti freccia non funzionano, come mai?

class CharValidator(wx.PyValidator):
def __init__(self, flag):
wx.PyValidator.__init__(self)
self.flag = flag
self.Bind(wx.EVT_KEY_DOWN , self.OnChar)
def Clone(self):
"""
Note that every validator must implement the Clone()
method.
"""
return CharValidator(self.flag)
def Validate(self, win):
return True
def TransferToWindow(self):
return True
def TransferFromWindow(self):
return True
def OnChar(self, evt):
key = chr(evt.GetKeyCode())
if key == 9 or key == 91: return

if self.flag == "no-alpha" and key in
string.letters:
return
if self.flag == "no-digit" and key in string.digits:
return
evt.Skip()

by Enzo