gtk.Bin — an abstract base class defining a container with just one child.
gtk.Bin
is an abstract base class defining a widget that is a container with just
one child. It is useful for deriving subclasses, since it provides the
common code needed for handling a single child widget. Many PyGTK widgets
are subclasses of gtk.Bin, including
gtk.Window,
gtk.Button,
gtk.Frame,
gtk.HandleBox,
and gtk.ScrolledWindow.