|  |  |  | GTK+ Reference Manual |  | 
|---|---|---|---|---|
#include <gtk/gtk.h>
                    GtkBin;
GtkWidget*          gtk_bin_get_child                   (GtkBin *bin);
  GObject
   +----GInitiallyUnowned
         +----GtkObject
               +----GtkWidget
                     +----GtkContainer
                           +----GtkBin
                                 +----GtkWindow
                                 +----GtkAlignment
                                 +----GtkFrame
                                 +----GtkButton
                                 +----GtkItem
                                 +----GtkComboBox
                                 +----GtkEventBox
                                 +----GtkExpander
                                 +----GtkHandleBox
                                 +----GtkToolItem
                                 +----GtkScrolledWindow
                                 +----GtkViewport
The GtkBin widget is a container with just one child. It is not very useful itself, but it is useful for deriving subclasses, since it provides common code needed for handling a single child widget.
Many GTK+ widgets are subclasses of GtkBin, including GtkWindow, GtkButton, GtkFrame, GtkHandleBox, and GtkScrolledWindow.