#!/usr/bin/ruby
  require 'gtk2'
class ListBox < Gtk::TreeView

  def initialize
    super()
    @renderer=Gtk::CellRendererText.new
    @renderer.set_property( 'background', 'lavender' )
    @renderer.set_property( 'foreground', 'black' )

    @list_store  = Gtk::ListStore.new(String)
    self.model = @list_store
    col_hdr = 'Ad Groups'
    @tree_view_col1 = Gtk::TreeViewColumn.new(col_hdr, @renderer, {:text => 0})
    @tree_view_col1.alignment = 0.5 # center
    self.append_column(@tree_view_col1)

    # Example Data:
    iter = @list_store.append
    iter.set_value(0, 'ulkomaanpuhelut')
    iter = @list_store.append
    iter.set_value(0, 'kaukopuhelut')
    iter = @list_store.append
    iter.set_value(0, 'suuntanumerot')

    self.signal_connect('button_release_event') do |widget,event|
      path, column, cell_x, cell_y = self.get_path_at_pos(event.x, event.y)
      puts widget.selection.selected[self.columns.index(column)]
    end

    self.signal_connect('key-release-event') do |widget,event|
      column = self.get_column(0)
      puts widget.selection.selected[self.columns.index(column)]
    end

  end
end

  Gtk.init
  @main_window = Gtk::Window.new
  @main_window.set_size_request 255,255
  lb = ListBox.new
  @main_window.add(lb)
  @main_window.show_all
  @main_window.signal_connect("destroy") { Gtk.main_quit }
  Gtk.main