code: public boolean removeControlListener(String name, Widget.OnTouchListener listener) {
          Widget control = findChildByName(name);
          if (control != null) {
              return control.removeTouchListener(listener);
          }
          return false;
      }
docs: Remove a touch listener for the button specified by {@code name}.
  @param name The {@linkplain Widget#getName() name} of the button to listen to
  @param listener A valid listener or null to clear