Depending on the status of the reftrack, enable or disable
        the status buttons, for imported/alien status buttons

        :returns: None
        :rtype: None
        :raises: None

def set_status_buttons(self, ):
        """Depending on the status of the reftrack, enable or disable
        the status buttons, for imported/alien status buttons

        :returns: None
        :rtype: None
        :raises: None
        """
        imported = self.reftrack.status() == self.reftrack.IMPORTED
        alien = self.reftrack.alien()

        for btn, enable in [(self.imported_tb, imported),
                            (self.alien_tb, alien)]:
            btn.setEnabled(enable)
            btn.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)