/**
  * create daily recur series
  * 
  * @param Tinebase_DateTime $dtstart
  * @return Calendar_Model_Event
  */
 protected function _getDailyEvent(Tinebase_DateTime $dtstart)
 {
     $event = new Calendar_Model_Event(array('summary' => 'Some Daily Event', 'dtstart' => $dtstart->toString(), 'dtend' => $dtstart->addHour(1)->toString(), 'rrule' => 'FREQ=DAILY;INTERVAL=1', 'container_id' => $this->_getTestCalendar()->getId(), 'attendee' => $this->_getAttendee()));
     return $this->_controller->create($event);
 }