rem: calendarViewController.deleteOccurrence(currentView().selectedItem); 
add: var selectedItems = currentView().getSelectedItems({}); for each (var item in selectedItems) { calendarViewController.deleteOccurrence(item); } 
context: function ltnDeleteSelectedItem() {    calendarViewController.deleteOccurrence(currentView().selectedItem);}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/6f55f2564dbea62417e1030763582b8d7ac85c20/messenger-overlay-sidebar.js/buggy/calendar/lightning/content/messenger-overlay-sidebar.js