GridDataFactory.fillDefaults().grab(true, true).applyTo(natTable);
// configure a painter that renders a line on top of the summary row
// this is necessary because the CompositeLayerPainter does not render
// lines on the top of a region
natTable.addOverlayPainter(new IOverlayPainter() {
@Override
public void paintOverlay(GC gc, ILayer layer) {
// render a line on top of the summary row
Color beforeColor = gc.getForeground();