// modify the tip as soon as it is read. If return wxEmptyString, then
// the tip is skipped, and the next one is read.
virtual wxString PreprocessTip(const wxString& tip);
// modify the tip as soon as it is read. If return wxEmptyString, then
// the tip is skipped, and the next one is read.
virtual wxString PreprocessTip(const wxString& tip);