- Disable_Symbols shows how to disable / enable label symbols.
- Functional shows how to use callback method with std::function, std::bind and lambda methods.
- Prevent_Hitting_Escape_Key_Closes_Windows shows how to prevent hitting 'Escape' key (FL_Escape) closes Windows with Fl::add_handler method.
- Widget_Wrapper shows how to use callback method with std::function, std::bind and lambda methods.