Sonar::TreemapBuilder in sonar 3.0

[run]

 Hi

  Which class is using in sonar 3.0  for listing the folders in tree structure.     I used  Sonar::TreemapBuilder
   
in sonar 2.11 for the same use .But it doesnt work in sonar 3.0  .Please help me.    



Thanks in advance
Arun