This demo illustrates that we can use a JavaScript object in a
      DOM bind/4 call.  Note that this prevents the passed object
      (the Button) to be reclaimed.  It is in general better to use
      find the addressed object(s) by navigating the DOM from the
      event target or find the object from their class
      or id property.
    
If you click the button, the label of the button is changed.