If the editor is enabled by pressing keys on the grid, this will be
        called to let the editor do something about that first key if desired.

def StartingKey(self, evt):
        """
        If the editor is enabled by pressing keys on the grid, this will be
        called to let the editor do something about that first key if desired.
        """

        key = evt.GetKeyCode()
        ch = None
        if key in [
                wx.WXK_NUMPAD0, wx.WXK_NUMPAD1, wx.WXK_NUMPAD2, wx.WXK_NUMPAD3,
                wx.WXK_NUMPAD4, wx.WXK_NUMPAD5, wx.WXK_NUMPAD6, wx.WXK_NUMPAD7,
                wx.WXK_NUMPAD8, wx.WXK_NUMPAD9]:

            ch = ch = chr(ord('0') + key - wx.WXK_NUMPAD0)

        elif key < 256 and key >= 0 and chr(key) in string.printable:
            ch = chr(key)

        if ch is not None and self._tc.IsEnabled():
            # For this example, replace the text.  Normally we would append it.
            #self._tc.AppendText(ch)
            self._tc.SetValue(ch)
            self._tc.SetInsertionPointEnd()
        else:
            evt.Skip()