rem: this.mCalendar.deleteItem(this.mItem, this.mListener); 
context:     undoTransaction: function () {        switch (this.mAction) {            case 'add':                this.mCalendar.deleteItem(this.mItem, null);                break;            case 'modify':                this.mCalendar.modifyItem(this.mOldItem, this.mItem, null);                break;            case 'delete':                this.mCalendar.addItem(this.mItem, null);                break;            case 'move':                this.mOldCalendar.addItem(this.mOldItem, this.mListener);                this.mCalendar.deleteItem(this.mItem, this.mListener);                break;        }    },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/45240709d0e9bbc2557382d8f3c777093a36bf31/calendar.js/clean/calendar/resources/content/calendar.js