Thank you for writing.
You can create your custom AggregateFunction. Included into your subscription is access to our source code. You can find it in Your Account
area of our site. Navigate to: PRODUCTS & SUBSCRIPTIONS -> DevCraft Ultimate -> Click DownloadInstaller and other resources
-> navigate to RadControls for WinForms
and select Browse all product files
-> Source Code.You can open it and see how we implemented our AggregateFunctions. You should look for AggregateFunctions.cs
in the Telerik.Pivot.Core.Aggregates
I hope this helps.
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