/** Remove VAlarm from VCalendar. */
 public void removeVAlarm() {
   if (vObjects != null) {
     for (VObject vObject : vObjects) {
       if ("VEVENT".equals(vObject.type)) {
         // As VALARM is the only possible inner object, just drop all objects
         if (vObject.vObjects != null) {
           vObject.vObjects = null;
         }
       }
     }
   }
 }