(debian,eclipse) modify the code of a window created with glade

hello,

I would like to create a window with glade, import it in a ruby project, and add a buton to it but from eclipse.

here it is an example:

···

************************************************
#!/usr/bin/env ruby
#
require 'libglade2'
require 'gtk2'
class MonAppli
  attr_accessor:main_glade_xml
  def initialize(file, root)
    @main_glade_xml = GladeXML.new(file, root) {|handler| method(handler)}
    #@main_glade_xml['fenetre_2'].show_all end
def on_button1_clicked
    puts "clicked !"
end
end

Gtk.init
a=MonAppli.new("/home/lolveley/eclipse/plan_de_travail/test_1/fenetre_2.glade",nil)

a.main_glade_xml["window1"].add_child(new Button("bouton 1"))

# marche
a.main_glade_xml["window1"].show_all
Gtk.main
**********************************************

but I can't find the correct term to use for "button" : I tried Gtk::button but I have this error then : "undefined method `Button' for Gtk:Module".

can you help me?

olivier.

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