code: def sort_model(self, *args, **kwargs):
          
          self.proxy.sort(17)  # sort the identifier
          self.proxy.sort(2)  # sort the element
          self.proxy.sort(1)  # sort the elementgrp
          self.proxy.sort(0)
docs: Sort the proxy model
  
          :returns: None
          :rtype: None
          :raises: None