'Remove the tab at offset *idx* in this sequence.'

def __delitem__(self, idx):

    tabs = self._pPr.tabs
    try:
        tabs.remove(tabs[idx])
    except (AttributeError, IndexError):
        raise IndexError(u'tab    index    out    of    range')
    if (len(tabs) == 0):
        self._pPr.remove(tabs)
