Set the values stored in our current in-view data to be values of the
        passed panel.  The passed panel must have the same indices as the panel
        that would be returned by self.get_current.

def set_current(self, panel):
        """
        Set the values stored in our current in-view data to be values of the
        passed panel.  The passed panel must have the same indices as the panel
        that would be returned by self.get_current.
        """
        where = slice(self._start_index, self._pos)
        self.buffer.values[:, where, :] = panel.values