/// <summary>
        /// 二級選單點選，初始化樹
        /// </summary>
        private void InitRightTree()
        {
            m_panelRight.Controls.Clear();
          //  m_panelRight.Visible = true;
            DevExpress.XtraTreeList.TreeList treeList = new DevExpress.XtraTreeList.TreeList();
            treeList.OptionsView.ShowCheckBoxes = true;
            treeList.Dock = DockStyle.Fill;
            m_panelRight.Controls.Add(treeList);
            DataTable dt = GetTestData();
            treeList.DataSource = dt;
            ////設定樹的ParentFieldName 屬性
            ////設定樹的KeyFieldName 屬性
            treeList.ParentFieldName = "ParentFieldName";
            treeList.KeyFieldName = "KeyFieldName";
        }
        /// <summary>
        /// 此處獲得繫結樹的資料
        /// </summary>
        /// <returns></returns>
        private DataTable GetTestData()
        {
            DataTable dt = new DataTable();
            DataColumn dc = new DataColumn("KeyFieldName");
            DataColumn dc3 = new DataColumn("ParentFieldName");
            DataColumn dc2 = new DataColumn("name");
            dt.Columns.Add(dc);
            dt.Columns.Add(dc2);
            dt.Columns.Add(dc3);
            for (int i = 0; i < 100; i++)
            {
                DataRow dr = dt.NewRow();
                dr["KeyFieldName"] = i;
                dr["ParentFieldName"] = (i % 5 == 0 ? "Null" : (i % 5).ToString());
                dr["name"] = i + "haha";
                dt.Rows.Add(dr);
            }
            return dt;

        }
 

//////////////////////////////////////////////////////////////////////

樹形控制元件是使用頻率很高的一種控制元件。對於屬性控制元件往往需要下面兩個功能
1.TreeList帶有CheckBox，並且節點要有三種狀態（所有的子節點都選中，所有的子節點都沒選擇，一部分子節點選中）。使用DevXpress的TreeList控制元件很容易實現這一功能。
設定TreeList.OptionsView.ShowCheckBoxes = true            //是否顯示CheckBox
設定TreeList.OptionsBehavior.AllowIndeterminateCheckState = true;         //設定節點是否有中間狀態，即一部分子節點選中，一部分子節點沒有選中
設定這兩個屬性之後就實現了TreeList帶有CheckBox,並且節點有三種狀態。
2.選中父節點或者子節點相互影響的功能，如選擇父節點選擇所有子節點。繫結TreeList的兩個事件AfterCheckNode和BeforeCheckNode
實現功能的程式碼如下：
 

        private void treeList1_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e)
        {
            SetCheckedChildNodes(e.Node, e.Node.CheckState);
            SetCheckedParentNodes(e.Node, e.Node.CheckState);
        }
private void treeList1_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e)
        {
            e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
        }
        /// <summary>
        /// 設定子節點的狀態
        /// </summary>
        /// <param name="node"></param>
        /// <param name="check"></param>
         private void SetCheckedChildNodes(TreeListNode node, CheckState check)
        {
            for (int i = 0; i < node.Nodes.Count; i++)
            {
                node.Nodes[i].CheckState = check;
                SetCheckedChildNodes(node.Nodes[i], check);
            }
        }
        /// <summary>
        /// 設定父節點的狀態
        /// </summary>
        /// <param name="node"></param>
        /// <param name="check"></param>
        private void SetCheckedParentNodes(TreeListNode node, CheckState check)
        {
            if (node.ParentNode != null)
            {
                bool b = false;
                CheckState state;
                for (int i = 0; i < node.ParentNode.Nodes.Count; i++)
                {
                    state = (CheckState)node.ParentNode.Nodes[i].CheckState;
                    if (!check.Equals(state))
                    {
                        b = !b;
                        break;
                    }
                }
                node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;
                SetCheckedParentNodes(node.ParentNode, check);
            }
        }