private UAReturn changeColMissing(string colName, string colProp, List<string> newMisVal, string mistype, ServerDataSource dataSource)
{
//return (dispatcher.EvaluateToObject(RCommandStrings.SetDatasetMissingProp(colName, colProp, newMisVal, mistype, dataSource), false) as string);
return (dispatcher.EvaluateToUAReturn(RCommandStrings.SetDatasetMissingProp(colName, colProp, newMisVal, mistype, dataSource)));
}