RadGridView will update the information on the aggregates added at runtime once a CollectionChanged
notification is raised from the bound source collection.
One way to do so is to apply any data operation - sorting, grouping or filtering. Another way would be to invoke RadGridView.CalculateAggregates() or RadGridView.Rebind() after you add the aggregate function.
radGridView.ShowColumnFooters = showFooter;
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