Brew MP 1.0.2
This type definition specifies the prototype for the function pointer used as the callback
function for selection events on a form. For example, a form that provides a standard list
mechanism (such as the list form) might identify its own selection callback so that it may
process the selection in some special way, unique to that form.
pv: A pointer to private data that is created and owned by the form receiving the
idOption: An identifier used to disambiguate items in the object that contains the items to be
selected. The identifier will vary from form type to form type. For example, a
list form would pass the item number of the item that has been selected, while a
popup menu may pass the menu ID of the particular menu item that has been selected.
More complex forms may choose to pass in data from an attached model to identify the