(From the top of my head, I guess this is for WinForms controls)
You will need two RepositoryItems objects: one without a clear button and one with a button (you can add buttons through the RepositioryItem Buttons property).
You will assign the RepositoryItem object without an additional button in the corresponding column.
Then you need to process the GridView CustomRowCellEditEventHandler. Verify that the e.RowHandle event is equal to GridControl.AutoFilterRow, and if so, assign e.RepositoryItem to RepositoryItem using the clear button.
Then edit the ClearOfficeItem ButtonClicked event of the clear clear button.
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