common legends for multiple dojo charts

Question

I'm trying to plot two charts having same legends(selectable legends) but different plotting values using DOJO charting. so i want to keep the legends as common for both the charts. So that if i unselected a legend it would effect to the both charts.

For clear reference please find my attachment dojo chart example image

new SelectableLegend({
                            chart: chart,
                            horizontal: true
                        }, legdiv);
                    });

above is the code used to generate legends.

Please help me to make it.