FacetChart - Show/Hide mini zoom chart

We're using SmartGWT Pro 4.0p-20140428.
We've requirement to allow a user to show/hide the mini zoom chart dynamically after the chart is displayed. I tried creating the FacetChart with mini zoom chart and using setVisible() on mini zoom chart
for e.g. miniZoomChart.setVisible(false); This does not seem to work.

Is there a way I can show/hide mini zoom chart after the chart is drawn without destroying the whole chart and recreating it?

Thanks,
Kiran Patel