Add a new tab stop at *position*, a |Length| object specifying the
        location of the tab stop relative to the paragraph edge. A negative
        *position* value is valid and appears in hanging indentation. Tab
        alignment defaults to left, but may be specified by passing a member
        of the :ref:`WdTabAlignment` enumeration as *alignment*. An optional
        leader character can be specified by passing a member of the
        :ref:`WdTabLeader` enumeration as *leader*.

def add_tab_stop(self, position, alignment=WD_TAB_ALIGNMENT.LEFT,
                     leader=WD_TAB_LEADER.SPACES):
        """
        Add a new tab stop at *position*, a |Length| object specifying the
        location of the tab stop relative to the paragraph edge. A negative
        *position* value is valid and appears in hanging indentation. Tab
        alignment defaults to left, but may be specified by passing a member
        of the :ref:`WdTabAlignment` enumeration as *alignment*. An optional
        leader character can be specified by passing a member of the
        :ref:`WdTabLeader` enumeration as *leader*.
        """
        tabs = self._pPr.get_or_add_tabs()
        tab = tabs.insert_tab_in_order(position, alignment, leader)
        return TabStop(tab)