Thank you for writing.
You need to take a couple more steps to make this scenario work. You have to set the AutoGenerateHierarchy property to true and you have to set the DataMember property, which is the parent table for your hierarchy. You can find more information on auto generated hierarchy grid in our product documentation - Binding to Hierarchical Data Automatically.
I hope this will help you. If you have further questions, I would be glad to assist you.
All the best,
the Telerik team
Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.