extern wxStaticText* add_label_to_grid_bag_sizer (wxGridBagSizer *, wxWindow *, wxString, wxGBPosition, wxGBSpan span = wxDefaultSpan);
extern std::string wx_to_std (wxString);
extern wxString std_to_wx (std::string);
extern wxStaticText* add_label_to_grid_bag_sizer (wxGridBagSizer *, wxWindow *, wxString, wxGBPosition, wxGBSpan span = wxDefaultSpan);
extern std::string wx_to_std (wxString);
extern wxString std_to_wx (std::string);