IColumnPropertyAccessor<MVirtualResource> columnPropertyAccessor = new VirtualRowColumnPropertyAccessor(columns);
			
			final CustomBodyLayerStack<MVirtualResource> bodyLayerStack = 
					new CustomBodyLayerStack<MVirtualResource>(
							viewData, 
							columnPropertyAccessor, new MVirtualResourceTreeFormat());
			
			// build the column header layer
			ILayer columnHeaderLayer = new ColumnHeaderLayer(new DataLayer(
					createColumnHeaderDataProvider(columns)), bodyLayerStack, bodyLayerStack.getSelectionLayer());
			
			// Add a group header for each column to display their origin.
			ColumnGroupHeaderLayer columnGroupHeaderLayer = new ColumnGroupHeaderLayer(columnHeaderLayer, bodyLayerStack.getSelectionLayer(), new ColumnGroupModel());
			setGroups(columnGroupHeaderLayer, columns);
			
			// register labels to identify column headers for styling configuration
			columnGroupHeaderLayer.setConfigLabelAccumulator(new IConfigLabelAccumulator() {
				@Override
				public void accumulateConfigLabels(LabelStack labelStack, int columnPosition, int rowPosition) {
					labelStack.addLabel("CUSTOM_HEADERS");
				}
			});
						
			// build the composite layer which regroup header and body layers
			CompositeLayer compositeLayer = new CompositeLayer(1, 2);
			compositeLayer.setChildLayer(GridRegion.COLUMN_HEADER, columnGroupHeaderLayer, 0, 0);
			compositeLayer.setChildLayer(GridRegion.BODY, bodyLayerStack, 0, 1);
			
			final NatTable natTable = new NatTable(parent, compositeLayer, false);
			natTable.setBackground(GUIHelper.COLOR_WHITE);
			GridDataFactory.fillDefaults().grab(true, true).applyTo(natTable);
			natTable.setLayerPainter(new NatGridLayerPainter(natTable, DataLayer.DEFAULT_ROW_HEIGHT));
			
			natTable.addConfiguration(new DefaultNatTableStyleConfiguration());
			
			final CustomRegistryConfiguration customConfiguration = new CustomRegistryConfiguration(columns);
			natTable.addConfiguration(customConfiguration);
			natTable.configure();

		Style style = new Style();
		Color color = Display.getDefault().getSystemColor(SWT.COLOR_CYAN);
		style.setAttributeValue(CellStyleAttributes.BACKGROUND_COLOR, color);
		configRegistry.registerConfigAttribute(CellConfigAttributes.CELL_STYLE, style, DisplayMode.NORMAL, "CUSTOM_HEADERS");

public void accumulateConfigLabels(LabelStack configLabels, int columnPosition, int rowPosition) {
    int idx = columnGroupHeaderLayer.getColumnIndexByPosition(columnPosition);
    // column group that starts at index 4 gets a custom label
    if (columnGroupModel.getColumnGroupByIndex(4).getMembers().contains(idx)) {
        configLabels.addLabel("custom_label");
    }
}