NS_ADDREF( *_retval );
oeEventEnumerator::GetNext(nsISupports **_retval){            if( mCurrentIndex >= mIdVector.size() )    {        *_retval = nsnull;    }    else    {        PRInt32 eventId = mIdVector[ mCurrentIndex ];                oeIICalEvent* event;              nsresult rv = mICal->FetchEvent( eventId, &event);        if( NS_FAILED( rv ) )            return rv;        *_retval = event;        ++mCurrentIndex;    }        return NS_OK;}