You can see here how the consistent naming of the form object is carried into the listbox data sources. This makes it easy to work with multiple listboxes on a single form simply by knowing the name ...

This class implements the vertical scrollbar for a listbox. It is subclassed from v_scrollbar and its only modification is that it understands that the buttons of the vertical scrollbar should cause ...

This class implements a style-nuetral listbox. This is the input behavior which is matched with the output behavior of listbox_display. All callbacks pass the currently focused on object as their data ...