code: public void registerPropertyConverter(String propertyName, Converter toConverter, Converter fromConverter) {
  		DefaultConversionService propertyConversionService = (DefaultConversionService) propertyConversionServices
  				.get(propertyName);
  		propertyConversionService.addConverter(toConverter);
  		propertyConversionService.addConverter(fromConverter);
  	}
docs: Register converters for a given property name.
  @param propertyName name of property on which to register converters
  @param toConverter Convert from source to target type
  @param fromConverter Convert from target to source type