InReplyToStatusId does not work with UpdateWithMedia

[jjw22new]

hi i use updatewithmedia in twitterizer

StatusUpdateOptions options = new StatusUpdateOptions();
if (in_reply_to_status_id != "")
{
options.InReplyToStatusId = Convert.ToDecimal(in_reply_to_status_id);
}

TwitterResponse twitterResponse = TwitterStatus.UpdateWithMedia(token, status, filePath, options);

i checked token and replystatusid, this is correct but not working options
at the result, updatewithmedia work to new status update.