public DateTimeProperty(string displayname, IColumn column)
{
Type = FilterType.DateTime;
// DisplayPrefix = "txt";
DisplayName = ResourceManager.GetString(displayname);
Column = column;
Operators = new[] { OperatorType.IsEqual, OperatorType.IsLarger, OperatorType.IsLargerOrEqual, OperatorType.IsSmaller, OperatorType.IsSmallerOrEqual };
}