From GNUstepWiki

It's a button, you push it and an event handler is called on the delegate, pretty simple.

XIB Fields

Name Type Description
NSNextResponder reference (Inherited from NSControl)
NSvflags int a bitmask that stores some flags on this button, don't know the specifices
NSFrame NSRect The space occupied relative to the superview
NSSuperview reference (Inherited from NSView)
NSEnabled bool Inherited from NSControl
NSButtonCell NSButtonCell The cell containing the display information for the button.