[configuration] how to comment / uncomment particular property in Java *.properties files

[Shalfey]

Hello,

I cannot find the functionality for commenting / uncommenting particular 
properties by their names. Let's say I have the property like this:

|app.dateFields=tranDate,expectedCloseDate,\
  closeDate,createdDate,lastModifiedDate,startDate,endDate,\
  salesEffectiveDate,shipDate,actualShipDate,ccExpireDate,\
  revecStartDate,revRecEndDate,validFrom,licenseDateUps,\
  blanketStartDateUps,blanketEndDateUps,shipDateFedEx,\
  homeDeliveryDateFedEx,dueDate,discountDate,billedDate|

I would like to use something like

|propertiesConfigurationLayout.commentProperty("app.dateFields");|

And have the commented property as a result:

|#  app.dateFields=tranDate,expectedCloseDate,\
#    closeDate,createdDate,lastModifiedDate,startDate,endDate,\
#    salesEffectiveDate,shipDate,actualShipDate,ccExpireDate,\
#    revecStartDate,revRecEndDate,validFrom,licenseDateUps,\
#    blanketStartDateUps,blanketEndDateUps,shipDateFedEx,\
#    homeDeliveryDateFedEx,dueDate,discountDate,billedDate|

And I would like to do the same thing to uncomment the property I need.

Is there a way to do this in Apache Commons Configuration? Or there is 
no standard way and I have to implement it on my own?

Initially I have created the topic on stackoverflow 
<http://stackoverflow.com/questions/23313323/comment-uncomment-particular-properties-in-java-properties-files-using-apach> 
and only after that I've noticed the Mailing List link. Sorry for that.

Thanks in advance,

Sergey