def initialize
super("range controls")
vbox = Gtk::VBox.new(false, 10)
add(vbox)
adjustment = Gtk::Adjustment.new(0.0, 0.0, 101.0, 0.1, 1.0, 1.0)
scale = Gtk::HScale.new(adjustment)
scale.set_size_request(150, 50)
scale.update_policy = Gtk::UPDATE_DELAYED
scale.digits = 1
scale.draw_value = true
vbox.add(scale)
scrollbar = Gtk::HScrollbar.new(adjustment)
scrollbar.update_policy = Gtk::UPDATE_CONTINUOUS
vbox.add(scrollbar)
vbox.add(Gtk::HSeparator.new)
button = Gtk::Button.new("close")
button.signal_connect("clicked"){destroy}
vbox.pack_start(button, true, true, 0)
button.can_default = true
button.grab_default
end