private PieChart createPieChart(Container parent) {
ensureData();
// We put an extra div in there to center our piechart and to apply
// the rounded corners and backing layer styles underneath the piechart.
Div centeringDiv = new Div(parent);
centeringDiv.addStyleName(getCss().pieChartContainer());
PieChart chart = new PieChart(centeringDiv, data, resources);
chart.showLegend();
return chart;
}