'Create a scrollable frame containing inner_box and with label_str
as its title.'

def create_scroll_frame(self, inner_box, label_str):

    label = Gtk.Label()
    label.set_markup((('<big>' + label_str) + '</big>'))
    scroll_box = GtkScrolledWindow(None, None)
    scroll_box.set_overlay_scrolling(False)
    scroll_box.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.ALWAYS)
    scroll_box.add(inner_box)
    frame = Gtk.Frame()
    frame.set_label_widget(label)
    frame.add(scroll_box)
    return frame
