Hello again Vivek,
Further investigation showed that this behavior is by design. It happens because actions in the gird (group, sort, filter) are performed after the new item is added on top. In order for the item to be shown first, you will need to apply such sort to the DataSource, as when inserted the default value of the field on which is sorted to be on the top. This will bubble the inserted record on the top of the group.
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