Hi Karen Grise,
Sorry for the late reply.
Unfortunately there is no way to this out-of-the box. There is a possible solution, which is a little bit tricky.
The problem comes from the fact that RadGridView reacts on every NotifyCollectionChanged with respect to sorting and grouping, therefore item is displayed on its correct position (according to sorting) (indeed this could looks like random position but it is not). Keeping this in mind you can workaround this by sorting your data manually and use RadGridView just to show current sorting (without RadGridView to be sorted). Then you will achieve the desired "insert" behavior.
For such example you can take a look at this online help topic.
Let me know if this doesn't help.
All the best,
the Telerik team
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