ILayer columnHeaderLayer = new ColumnHeaderLayer(
new DefaultColumnHeaderDataLayer(columnHeaderDataProvider),
bodyLayer, selectionLayer);
// Row header
IDataProvider rowHeaderDataProvider = new DefaultSummaryRowHeaderDataProvider(
bodyLayer.getDataLayer().getDataProvider(), "\u2211");
ILayer rowHeaderLayer = new RowHeaderLayer(
new DefaultRowHeaderDataLayer(rowHeaderDataProvider),
bodyLayer, selectionLayer);