Thank you for contacting Telerik support.
This functionality is not supported by RadGridView. As long as any sorting is applied to the grid the newly added rows will be inserted regarding to the sort order.
As a suggestion for this case you can disable the sorting in the grid and manually order the items in the collection in such way that their order meet your criteria. This way the grid will display the rows regarding of the objects order in the collection.
I hope this information helps. Should you have any other questions, I will be glad to assist you.
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