<div apply="org.zkoss.zkcharts.essentials.exporting.ExportComposer">
        <charts id="mychart" type="pie"/>
    </div>

public class ExportComposer extends SelectorComposer<Component> {

	@Wire
    private Charts mychart;
	private static final String ON_MY_CUSTOM_ITEM = "onMyCustomItem";
    
	private SingleValueCategoryModel model = new DefaultSingleValueCategoryModel();
	
	@Override
    public void doAfterCompose(Component comp) throws Exception {
        super.doAfterCompose(comp);
        model.setValue("Mine",32);
        model.setValue("Yours",12);
        model.setValue("His",20);
        model.setValue("Ours",14);
        model.setValue("Theirs",55);
       
        mychart.setModel(model);

        mychart.getPlotOptions().getPie().setShowInLegend(true);
         mychart.addEventListener(ChartsEvents.ON_PLOT_LEGEND_ITEM_CLICK, new EventListener<Event>() {

            @Override
            public void onEvent(Event event) throws Exception {
                System.out.println(event);
            }

        });
    }
};

chart.getPlotOptions().getPie().addExtraAttr("point",
         new JavaScriptValue("{ events: { legendItemClick: e => false } }"));