class ClockWindow : public wxWindow
   // ClockWindow will be developed in Chapter 27
{
public:
   . . .
   virtual void OnPaint(wxPaintEvent& event);
   virtual void OnMouseEvent(wxMouseEvent& event);
   . . .
};

void ClockWindow::OnMouseEvent(wxMouseEvent& event)
{
   . . . // Implement mouse events for this specific application
}