'Within a section/subsection, navigate to the vertical with `vertical_title`.'

def go_to_vertical(self, vertical_title):

    all_items = self.sequence_items
    try:
        seq_index = all_items.index(vertical_title)
    except ValueError:
        msg = "Could    not    find    sequential    '{0}'.        Available    sequentials:    [{1}]".format(vertical_title, ',    '.join(all_items))
        self.warning(msg)
    else:
        seq_css = 'ol#sequence-list>li:nth-of-type({0})>.nav-item'.format((seq_index + 1))
        self.q(css=seq_css).first.click()
        self.wait_for_ajax()
