code: def insertValue(self, pos, configValue, displayValue=None):
          
          self._configValues.insert(pos, configValue)
          self._displayValues.insert(pos, displayValue if displayValue is not None else configValue)
docs: Will insert the configValue in the configValues and the displayValue in the
              displayValues list.
              If displayValue is None, the configValue is set in the displayValues as well