The definition of the extended UI elements of a single add-in function.
A CXlWizExUIFunctionDescriptor object holds all the extended user interface elements that have been defined for the arguments of a single add-in function.
Developers do not normally need to access it directly. When creating and registering extended UI elements, it is simpler to use the creator classes CXlWizExUIArgumentListCreator and CXlWizExUIArgumentPopupCreator.
The class is most likely to be used directly when setting up dynamic value lists, when it can be used to override a standard value list with a dynamically-created list.