
               **************
               ***  DEMO  ***
               **************

 --- MAIN : create the user defined Run and Event actions, and
     add the visualization command  /tracking/storeTrajectory 1  
     in order to visualize events. 

 --- RUN ACTION : define the Run action in order to visualize events.
     (however, it will be useful also later on for the analysis...)

 --- EVENT ACTION : define the Event action in order to visualize events.
 
