splineButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
RankingFunction function = (RankingFunction) model.getSelectedFunction();
if (splineEditor == null) {
splineEditor = new SplineEditor(NbBundle.getMessage(AppearanceTopComponent.class, "AppearanceTopComponent.splineEditor.title"));
}
Interpolator interpolator = function.getRanking().getInterpolator();
if (interpolator instanceof Interpolator.BezierInterpolator) {
Interpolator.BezierInterpolator bezierInterpolator = (Interpolator.BezierInterpolator) interpolator;
splineEditor.setControl1(bezierInterpolator.getControl1());