code: public boolean addControlListener(String name, Widget.OnTouchListener listener) {
          Widget control = findChildByName(name);
          if (control != null) {
              return control.addTouchListener(listener);
          }
  
          return false;
      }
docs: Add a touch listener for the button specified by {@code name}.  The listener is only
  registered if the button is actually present.
  
  @param name The {@linkplain Widget#getName() name} of the button to listen to
  @param listener A valid listener or null to clear
  @return {@code True} if a valid listener was passed and the named button is present;
  {@code false} in all other cases.