@property<EOL><INDENT>def _selection_name(self):<DEDENT>
if self._selection is None:<EOL><INDENT>return self.obj.name<EOL><DEDENT>else:<EOL><INDENT>return self._selection<EOL><DEDENT>
since we are a series, we by definition only have
a single name, but may be the result of a selection or
the name of our object