c# - 添加默认节点以过滤控件 Devexpress

Question

当打开一些默认参数的过滤器控件出现给用户时，我需要知道如何向过滤器控件添加模式我尝试如下

 [C#]Open in popup window
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);
}

问题是节点以这种方式出现，但您无法通过单击“x”侧来删除它们

devexpress的版本是2012

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;
    }