In the above picture, the class Collection is shown. The left list pane shows the categories of the various methods belonging to Collection. CLD-API is selected; the right list pane shows the methods in the category CLD-API. The radio button below this pane controls whether you are looking at instance method categories or class method categories. The tabs above this pane control whether the methods displayed are public or private.

Finally, notice the text pane below the list panes. It is decorated with several tabs. The Class Definitions tab is active; the text pane contains the class definition for Collection. From it you can tell that Collection is a subclass of Object.