add:   updateAddExceptionButton() updateDeleteExceptionButton(); 
context: function removeSelectedExceptionDate(){    var exceptionsListbox = document.getElementById( "exception-dates-listbox" );    var SelectedItem = exceptionsListbox.selectedItem;    if( SelectedItem )        exceptionsListbox.removeChild( SelectedItem );}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/7ef01c388b38934756f44cc6656ae2041442ea60/eventDialog.js/clean/calendar/resources/content/eventDialog.js