'Return owner of X selection.
The following keyword parameter can
be provided:
selection - name of the selection (default PRIMARY),
type - type of the selection (e.g. STRING, FILE_NAME).'

def selection_own_get(self, **kw):

    if ('displayof' not in kw):
        kw['displayof'] = self._w
    name = self.tk.call((('selection', 'own') + self._options(kw)))
    if (not name):
        return None
    return self._nametowidget(name)
