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Libglade can be extended to support widget libraries built
      on top of GTK+.  These modules are loaded dynamically at
      runtime.  These modules are loaded when
      <requires> elements are found in the
      glade file.
Currently there are libglade module support for libbonoboui libgnomecanvas and libgnomeui. Note that libglade can also handle widgets that implement the properties interfaces with no extra code.
While no additional libglade initialisation is required to
      use a module, however, the underlying library might need
      initialisation.  For instance, to use libgnomeui widgets from
      libglade, you must call
      gnome_program_init beforehand.