i want to draw tree using arrows dynamicaly

[Gladsomebeast]

I would draw the tree with on-the-fly nodes. Set the parent of each on-the-fly nodes to a common viz.GROUP node. Thus you could move and scale the viz.GROUP node to reposition the tree.

This article has examples of hierarchical on-screen objects:
> http://vizworkshop.com/articles/vizi...parenting.html