code: function( event, drag ) {
  			var el, drops, selector, sels;
  			this.last_active = [];
  			for(var i=0; i < this._elements.length; i++){ //for each element
  				el = this._elements[i]
  				var drops = $.event.findBySelector(el, eventNames)
  
  				for(selector in drops){ //find the selectors
  					sels = selector ? jQuery(selector, el) : [el];
  					for(var e= 0; e < sels.length; e++){ //for each found element, create a drop point
  						jQuery.removeData(sels[e],"offset");
  						this.add(sels[e], new this(drops[selector]), event, drag);
  					}
  				}
  			}
  			
  		}
docs: Gets all elements that are droppable, adds them