[ns] how to chang the shape of the nodes

[Panks PB]

hi,

  i'm working in ns2.33. I executed the wireless1.tcl which is available in
Marc Greis' tutorial.In my nam window the nodes look very small.I tried to
change the shape of the node by giving

$node_(0) shape "box"

but no change in my nodes.plz help me how to change and enlarge its size.

Thank you