Question about drawing dendogram.

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Hi.

I am trying to draw interactive dendogram (tree) with visad. 
I am novice to VISAD, and I have not found any clue how to draw dendogram. 
It will be nice if I can have any similar simple example or some
direction.

Example of dendogram:

        +-----
  ______|
  |     |
--+     +-----
  |
  |___________
   

Data have all necessary information to draw dendogram (node position,
length of each edge...)

Thank you,
Sohyoung.