Add, remove, or leave alone the ``<c:dLbls>`` child element depending
        on current state and assigned *value*. If *value* is |True| and no
        ``<c:dLbls>`` element is present, a new default element is added with
        default child elements and settings. When |False|, any existing dLbls
        element is removed.

def has_data_labels(self, value):
        """
        Add, remove, or leave alone the ``<c:dLbls>`` child element depending
        on current state and assigned *value*. If *value* is |True| and no
        ``<c:dLbls>`` element is present, a new default element is added with
        default child elements and settings. When |False|, any existing dLbls
        element is removed.
        """
        if bool(value) is False:
            self._element._remove_dLbls()
        else:
            if self._element.dLbls is None:
                dLbls = self._element._add_dLbls()
                dLbls.showVal.val = True