Thanks for getting back to us.
We didn't manage to make the group descriptors bindable due to many ongoing tasks with higher priority. We apologize for the inconvenience caused.
The GroupDescriptors collection is something like the Items collection in ItemsControl - this collection cannot be set, it is used to access the available items within the control or when items are manually added. So, instead of adding a setter to the GroupDescriptors property we may add a GroupDescriptorsSource which may be used to describe a sequence of descriptors to be internally processed and added to the GroupDescriptors collection.
We will implement this scenario for each of the three Descriptors collections - Group, Filter and Sort. We will do our best to make this available for the first Service Pack released for Q3 2011 - that would be within a month.
I hope this information is useful. Let me know if I can assist you in some other way.
the Telerik team
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