extern void message_dialog (wxWindow *, wxString);
extern bool confirm_dialog (wxWindow *, wxString);
extern wxStaticText* add_label_to_sizer (wxSizer *, wxWindow *, wxString, bool left, int prop = 0);
extern void message_dialog (wxWindow *, wxString);
extern bool confirm_dialog (wxWindow *, wxString);
extern wxStaticText* add_label_to_sizer (wxSizer *, wxWindow *, wxString, bool left, int prop = 0);