rem: calendarViewController.modifyOccurrence(currentView().selectedItem); 
add: var selectedItems = currentView().getSelectedItems({}); for each (var item in selectedItems) { calendarViewController.modifyOccurrence(item); } 
context: function ltnEditSelectedItem() {    calendarViewController.modifyOccurrence(currentView().selectedItem);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/6f55f2564dbea62417e1030763582b8d7ac85c20/messenger-overlay-sidebar.js/buggy/calendar/lightning/content/messenger-overlay-sidebar.js