Label Format - HTML / Plain Text (default)

I created an additional property for Labels, i.e. LabelFormat, where user can choose which format to show for label. If user chooses HTML Text, then all the contents in label will render the text as html else it will render normally in plain text.

I uploaded my changes to google appengine, here is the url:
http://1.manishkk74.appspot.com/
I am not able to build server in google appengine, and no clear process is defined about how to do that.

Let me know if above explanation makes sense.