There is no way to use tree as a column in a grid. A TreeGrid would use hierarchical datasource where one column would show nodes and other columns would show node properties. Here is an example (from Sencha Ext JS) http://dev.sencha.com/deploy/ext-4.1.0-gpl/examples/tree/treegrid.html
I have a big fat telerik asp.net TreeList in the middle of my page for now. It is an awesome control but I would prefer to go all the way Kendo UI.
This is a must-have component, please add an easy to use TreeGrid! I also have used ExtJS treegrid in other projects.