code: function(e,a){
  		 this.ddlist.addItem({label: this.el.value});
  		 this.el.value = "";
  		 this.hiddenEl.value = "";
     	this.fireUpdatedEvt();
  
  	 }
docs: onAdd : fired when someone click on the field button
  <ul>
  <li>Add an element to the list from the value of the field </li>
  </ul>