Treeview getting a Horizontal bar

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after each first level of the tree.

Hi ,
I have a treeview which shows the employee hierarchy.
I need to get a Horizontal bar after the fiirst level.
How can i get this done? Some code help would be great.
Eg:
Supervisor
__________________________________
     Subordinate 1
          Subordinate A
          Subordinate B
________________________________
     Subordinate 2
________________________________
     Subordinate 3
           Subordinate C
           Subordinate D
                   Subordinate D1
        &n ...