The Sorting feature is disabled by default.
To enable sorting:
The Filtering feature is disabled by default.
The Total Summary feature is disabled by default.
To show summaries:
You can create and edit unbound columns, but cannot use them to apply data shaping operations (sorting, grouping, summaries).
If you have to calculate values on server by several columns, specify custom PropertyDescriptors using the VirtualSourceBase.CustomProperties property.
The DataControlBase.SelectAll method is ignored.