It happened that I have a sample project with a 2 level hierarchical RadGrid, which has buttons in the DetailTable and if they are getting clicked, they get a reference to the parent item as dataItem, and/or TableView. The same approach can be used to achieve a scenario for a 3 or more level Hierarchical grid.
Please check out the attached webforms page. All you need is to import it into a Website and run it. Since it has dummy data bound to it, there is no need to setup SQL connection. I've tried to descriptive in the code as much as possible.
Please let us know if you have questions.
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