title: How to display the total in a StackedXYBarChart
body: <p>I create and pass a TimeTableXYDataset to display a StackedBarChart, quite similar to the StackedXYBarChartDemo2 from the demo package. In addition to the values displayed as ItemLabels, I would like to display the sum of all values above every bar. Does anyone know if this is doable, and how ?</p>