rowHeaderDataProvider);
ILayer rowHeaderLayer = new RowHeaderLayer(rowHeaderDataLayer,
viewportLayer, selectionLayer);
// build the corner layer
IDataProvider cornerDataProvider = new DefaultCornerDataProvider(
columnHeaderDataProvider, rowHeaderDataProvider);
DataLayer cornerDataLayer = new DataLayer(cornerDataProvider);
ILayer cornerLayer = new CornerLayer(cornerDataLayer, rowHeaderLayer,
columnHeaderLayer);