# File gtk/sample/gtk-demo/changedisplay.rb, line 119
    def fill_screens
      @screen_model.clear

      if @current_display
        n_screens = @current_display.n_screens

        n_screens.times do |i|
          iter = @screen_model.append
          iter.set_value(SCREEN_COLUMN_NUMBER, i)
          iter.set_value(SCREEN_COLUMN_SCREEN, @current_display.get_screen(i))

          if i == 0
            @screen_selection.select_iter(iter)
          end
        end
      end
    end