public void actionPerformed(ActionEvent event) {
Object src = event.getSource();
if (src == addElementButton) {
PeriodicTableDialog dialog = new PeriodicTableDialog();
dialog.setVisible(true);
String chosenElement = dialog.getSelectedElement();
if (chosenElement == null)
return;
ElementRule rule = new ElementRule(chosenElement, 0, 100);
elementsTableModel.addRow(rule);
}