private void bind() {
   workspace
       .getExecuteButton()
       .addClickHandler(
           new ClickHandler() {
             @Override
             public void onClick(ClickEvent event) {
               execute();
             }
           });
   workspace
       .getSaveButton()
       .addClickHandler(
           new ClickHandler() {
             @Override
             public void onClick(ClickEvent event) {
               save();
             }
           });
   workspace
       .getStopButton()
       .addClickHandler(
           new ClickHandler() {
             @Override
             public void onClick(ClickEvent event) {
               scheduler.togglePlayPause();
             }
           });
 }