'Insert a newly created `w:tab` child element in *pos* order.'

def insert_tab_in_order(self, pos, align, leader):

    new_tab = self._new_tab()
    (new_tab.pos, new_tab.val, new_tab.leader) = (pos, align, leader)
    for tab in self.tab_lst:
        if (new_tab.pos < tab.pos):
            tab.addprevious(new_tab)
            return new_tab
    self.append(new_tab)
    return new_tab
