code: function( event ) {
  			if ( this._cancelled ) {
  				return;
  			}
  			if (!this._only && this.constructor.responder ) {
  				this.constructor.responder.end(event, this);
  			}
  
  			this.callEvents('end', this.element, event);
  
  			if ( this._revert ) {
  				var self = this;
  				this.movingElement.animate({
  					top: this.startPosition.top() + "px",
  					left: this.startPosition.left() + "px"
  				}, function() {
  					self.cleanup.apply(self, arguments);
  				});
  			}
  			else {
  				this.cleanup();
  			}
  			this.event = null;
  		}
docs: Called on drag up
  @hide
  @param {Event} event a mouseup event signalling drag/drop has completed