Hi,

As it turns out this is not an issue. If you are using the following code for adding a new item: 

     var newRow = (this.DataContext as MyViewModel).DataTable.DefaultView.AddNew();
     newRow["FirstName"] = "John";
     newRow["LastName"] = "Doe";
     newRow["JobUnitStatus"] = "C";
     newRow.EndEdit();

a CollectionChanged event is raised before updating the new item (when calling the AddNew method of the DefaultView). RadGridView depends on this event in order to populate its groups. So, in this scenario, it will create a group with an empty Key. Which will results in the wrong behavior at a later stage. If the item is created first and then added in the source collection of the RadGridView, then the group will be created with a proper Key and the issue will not be observed. For example:

    var newRow = (this.DataContext as MyViewModel).DataTable.NewRow();
            newRow["FirstName"] = "John";
            newRow["LastName"] = "Doe";
            newRow["JobUnitStatus"] = "C";
            (this.DataContext as MyViewModel).DataTable.Rows.Add(newRow);

Regards,
Yoan
Progress Telerik