Tree in a Grid - How to change cell height

I have a tree object in a grid cell. How can a dynamically change the grid cell heigt depending on the data nodes of the tree object.

I would like to resize the grid cell heigt once the tree has been enlarged and reduce the grid cell height once the tree has been closed.

Thanks
Jörg

Pls check the thread dated : Tuesday, February 21, 2006
http://www.activewidgets.com/javascript.forum.12038.19/expanding-collapsing-a-row-experiment.html
HTH