def increment_prop_value( self, name_IN, value_IN = 1, *args, **kwargs ):
     
     '''
     Accepts name, and optional increment value.  Increment value defaults to
        1.  Retrieves value as int, adds value_IN to it, then stores and
        returns the result.
     '''
     
     # return reference
     value_OUT = None
     
     # use DictHelper
     value_OUT = DictHelper.increment_int_dict_value( self.m_prop_value_dict, name_IN, value_IN )
     
     return value_OUT