anchor.diff:    protected
       FSorted : boolean;
       FFiltered : boolean;
  +    FOnFilter : TmOnFilterVirtualDataset;
   
       function DoSort : boolean;
       procedure ClearSort;
  
positive.code:     FFiltered := false;
    end;
    FSummaryManager.NotifyChanges;
  end;
  
  procedure TmCustomVirtualDataset.ClearFilter;
  
negative.code:     property AutomaticInitFieldsFormat : boolean read FAutomaticInitFieldsFormat write FAutomaticInitFieldsFormat;
  
      property DatasetDataProvider : TmVirtualDatasetDataProvider read FVirtualDatasetProvider write FVirtualDatasetProvider;
      property OnFilter : TmOnFilterVirtualDataset read FOnFilter write FOnFilter;
    end;
  
    TmVirtualDataset = class(TmCustomVirtualDataset)
  