TreeView Problem

Hi,

I am using a tree view web_ctrl1.0 of net on my aspx page. the tree view

control has checkboxes in it as follows:

parentnode -> childnode -> subnodes.

every node(i.e parent node, child node , sub nodes) has checkboxes in it. my

requirement is that when i click on the checkbox on the parent node the

child nodes and subsequnetly all sub nodes should be checked automatically.

Pl help me in finding solution.
thanks in advance.