The value is updated to the Grid (flat grid) when it is changed or when the records are updated in the DataSource, by default. But, in the nested table or child row, you need to update the child row records based on its value by refreshing the row range. To refresh the row range, the ListChanged event can be used. In this event, the row can be refreshed by using the RefreshRange method when the items are changed.
The following screenshot represents the Grid before updating:
The following screenshot represents the Grid after updating:
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