rowHeaderDataLayer.setDefaultColumnWidth(40);
ILayer rowHeaderLayer = new RowHeaderLayer(rowHeaderDataLayer,
viewportLayer, selectionLayer);
ILayer cornerLayer = new CornerLayer(new DataLayer(
new DefaultCornerDataProvider(columnHeaderDataProvider,
rowHeaderDataProvider)), rowHeaderLayer,
columnHeaderLayer);
GridLayer compositeLayer = new GridLayer(viewportLayer,
columnHeaderLayer, rowHeaderLayer, cornerLayer);