private void configurePieChartButtonActionPerformed( java.awt.event.ActionEvent evt) { // GEN-FIRST:event_configurePieChartButtonActionPerformed if (pieChart == null) { pieChart = manipulator.buildPieChart(valuesFrequencies); } if (pieChartDialog != null) { pieChartDialog.setVisible(true); } else { pieChartDialog = new JFreeChartDialog( WindowManager.getDefault().getMainWindow(), pieChart.getTitle().getText(), pieChart, 1000, 1000); } } // GEN-LAST:event_configurePieChartButtonActionPerformed