sliderOptions.setRange(true);
// sliderOptions.setOnChange("console.log('ui: ' + ui.toSource());", "e", "ui");
@SuppressWarnings("serial")
final Slider slider = new Slider("slider", sliderOptions, sliderOneHandleSettings, sliderTwoHandleSettings) {
@Override
public void onChange(AjaxRequestTarget target, String handleId, int value) {
info(String.format("Handle with id '%s' changed its value to '%d'",
handleId, value));