VS 2005: Problem finding the Parent node of Child Node

Question

Hello All,

        I am using a tree structure in my webpage. I load the basic tree structure on page load and  wanted to load the children of those nodes on the fly and so I used the eventhandler  but after I catch the event and get the node and try to find the parent of the node it is givining me NULL value but it is showing the depth correctly I think the parent node for only root node will be null. Can anyone tell me if I have enable any feature or anything that I am missing.

              Thanks,
                   Ram