See Also: Container Members A Gtk# user interface is constructed
by nesting widgets inside widgets. Gtk.Container widgets are the
inner nodes in the resulting tree of widgets: they contain other
widgets. So, for example, you might have a Gtk.Window containing
a Gtk.Frame containing a Gtk.Label. If you wanted an image
instead of a textual label inside the frame, you might replace
the Gtk.Label widget with a Gtk.Image widget. The first type of
Gtk.Container widget has a single child widget and derives from
Gtk.Bin. These containers are decorators, which add some kind of
functionality to the child. For example, a Gtk.Button makes its
child into a clickable button; a Gtk.Frame draws a frame around
its child and a Gtk.Window places its child widget inside a top-
level Gtk.Window. The second type of Gtk.Container can have more
than one child; its purpose is to manage layout. This means that
these containers assign sizes and positions to their children.
For example, a Gtk.HBox arranges its children in a horizontal ro