Could you please elaborate more on your particular requirement since this can be implemented in various ways? I prepared a sample for you that can be used with dlls from Q2 2012 SP (0725) or sooner. Basically, you can press Layout Button, then select an item that has a parent and press the button Add Parent Shape. This will create a corresponding item in the ViewModel connected both to the selected item and its parent. Then you can again press Layout button. Hope this will help you proceed further.
All the best,
the Telerik team