GTK3-Class Extensions not possible

Hello,

for some reasons I extend ruby GTK3 class with some functions. This works

very well with ruby-gtk3 2.2.5-4 build1. With ruby-gtk 3.2.4-1 I get 
always the following error:

comboboxtext_mod.rb:8: warning: previous definition of ComboBoxText was here
Traceback (most recent call last):
comboboxtext_mod.rb:31:in `<main>': undefined method `set_names' for 
#<Gtk::ComboBoxText:0x5628eabeb0e0 ptr=0x5628eb0102c0> (NoMethodError)
Did you mean?  set_name


Cheers


#!/usr/bin/env ruby


require "gtk3"
require "pry"


class Gtk::ComboBoxText

     def set_names aL
         aL.each{|x| self.append_text x}
     end

end



if str = Gtk.check_version(3, 10, 7)
   puts "This sample requires GTK+ 3.10.7 or later"
   puts str
   exit
end

window = Gtk::Window.new("Gtk::ComboBox sample")
window.signal_connect("destroy") {Gtk.main_quit}

#
# Text only
#
@combo1 = Gtk::ComboBoxText.new()  #(:entry => true)
    @combo1.set_names ["foo", "bar", "fuga", "hoge"]
     @combo1.active = 1

@combo1.signal_connect("changed") do

   @combo1 = Gtk::ComboBoxText.new
    @combo1.set_names ["moon", "mars"]
     @combo1.active = 0
     @combo1.remove_all
end

button = Gtk::Button.new(:label => "close")
button.signal_connect("clicked") do
   @combo1.remove_all
   #Gtk.main_quit
end


# Show main window
vbox = Gtk::Box.new(:vertical)
vbox.add(@combo1)
vbox.add(button)
window.add(vbox).show_all

Gtk.main



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