click event of pie chart of invient charts

How can I create a pop up screen about the part that user clicked in pie chart when user clicks the part of the pie chart. For instance;
My pie chart shows the distribution of languages such as 40% English, 20% French 10% Italian 30% German. What I want is when user clicks on to the English part of the pie chart, the pop up screen that includes information about that part must be shown. So how can I do this with invient charts?

You can use the InvientCharts click listener and add the popup with something like the Overlays add-on, found
here
.