self << (@up_button=GuiButton.new.set(:scale_x => 0.05, :scale_y => 0.07, :offset_x => -0.17, :offset_y => 0.5 - 0.23, :background_image => $engine.load_image('images/buttons/directory-up.png'), :background_image_hover => $engine.load_image('images/buttons/directory-up-hover.png')))