+ // set the string values returned by GetValue() for the true and false
+ // states, respectively
+ static void UseStringValues(const wxString& valueTrue = _T("1"),
+ const wxString& valueFalse = wxEmptyString);
+
+ // return true if the given string is equal to the string representation of
+ // true value which we currently use
+ static bool IsTrueValue(const wxString& value);
+