GnomeDockItem is a container
that allows its child to appear on a GnomeDock. Dock items can be detached
from their parent window and placed anywhere on the
desktop; they can also be moved around within the dock.
GnomeDock lets users
rearrange Gnome toolbars.
GnomeDockItem provides the "handle" for dragging
its child. GnomeApp uses GnomeDock internally, so Gnome
toolbars are all repositionable.
