### - a -

- AboutWidgets : misc_gui.cpp
- AccelerationModel : vehicle_type.h
- AccelStatus : train.h
- AddNewGRFWindowWidgets : newgrf_gui.cpp
- AIConfigFlags : ai_info.hpp
- AIConfigWindowWidgets : ai_gui.cpp
- AIConstructionEvent : newgrf_generic.h
- AIDebugWindowWidgets : ai_gui.cpp
- AIListWindowWidgets : ai_gui.cpp
- AircraftSpeedLimits : aircraft_cmd.cpp
- AircraftSubType : aircraft.h
- AirportPickerWidgets : airport_gui.cpp
- AISettingsWindowWidgest : ai_gui.cpp
- ArrowWidgetValues : widget_type.h
- Axis : direction_type.h