# File gtk/sample/gtk-demo/appwindow.rb, line 216
    def register_stock_icons
      # Register our stock items
      Gtk::Stock.add(:demo_gtk_logo, '_GTK!')

      # Add out custom icon factory to the list of defaults
      factory = Gtk::IconFactory.new
      factory.add_default

      filename = Demo.find_file('gtk-logo-rgb.gif')
      pixbuf = Gdk::Pixbuf.new(filename)

      transparent = pixbuf.add_alpha(true, 0xff, 0xff, 0xff)

      icon_set = Gtk::IconSet.new(transparent)
      factory.add('demo_gtk_logo', icon_set)
    end