NSWindowTab
A tab associated with a window that is part of a tabbing group.
Declaration
class NSWindowTabOverview
NSWindowTab describes the way a window displays as part of a tabbed window group. The properties of NSWindowTab are configurable at any time, but only take effect when the associated NSWindow displays in a tab.
AppKit automatically creates an instance of NSWindowTab for each NSWindow. You can access a window’s tab object using the tab property.