C# 将默认节点添加到筛选器控件Devexpress

我需要知道当用户看到打开一些默认参数的filtercontrol时，如何向filtercontrol添加模式 我试了以下方法

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private void Padroes(ControleCaixaFiltro _controleCaixaFiltro, PropertyInfo prop)
{
           CustomClauseNode clausula = new CustomClauseNode(_controleCaixaFiltro.Model);                
           FilterControlHelpers.ForceAdditionalParamsCount(clausula.AdditionalOperands, 1);
           clausula.Operation = ClauseType.Equals;     
           clausula.FirstOperand = new OperandProperty(prop.Name);
           clausula.ChangeElement(ElementType.Operation);
           _controleCaixaFiltro.NoPrincipal.SubNodes.Add(clausula);
}

问题是，这样会显示节点，但不能通过单击x侧来删除它们

devexpress的版本是2012年

此代码不起作用

protected override ClauseNode CreateDefaultClauseNode(FilterColumn column)
    {
        ClauseNode defaultNode = base.CreateDefaultClauseNode(column);
        if (defaultNode.AdditionalOperands.Count > 0)
        {
            OperandValue rightOperand = defaultNode.AdditionalOperands[0] as OperandValue;
            if (rightOperand != null)
            {
                rightOperand.Value = DateTime.Now;
            }
        }

        return defaultNode;
    }