code: def set_status_buttons(self, ):
          
          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)
docs: Depending on the status of the reftrack, enable or disable
          the status buttons, for imported/alien status buttons
  
          :returns: None
          :rtype: None
          :raises: None