public class AnchorPanel

    {

        List<PanelMenu> lst = new List<PanelMenu>();

        Control MenuPan { get; set; }

        XtraScrollableControl XSControl;

        public AnchorPanel(Panel PanMenu, XtraScrollableControl xtraScrollableControl)

        {

            MenuPan = PanMenu;

            XSControl = xtraScrollableControl;

            XSControl.Scroll += XSControl_Scroll;

            XSControl.MouseWheel += XSControl_MouseWheel;

            XSControl.SizeChanged += XSControl_SizeChanged;

            XSControl.VerticalScroll.LargeChange = ;

        }

        void XSControl_SizeChanged(object sender, EventArgs e)

        {

            if (LastAnchor != null && LastAnchorIniHeight < (sender as Control).Height)

            {

                LastAnchor.AnchorContainer.Height = (sender as Control).Height;

            }

        }

        #region 容器滚动条移动事件

        void XSControl_MouseWheel(object sender, MouseEventArgs e)

        {

            XSControl_Scroll(sender, null);

        }

        void XSControl_Scroll(object sender, XtraScrollEventArgs e)

        {

            CurrentLable = GetMenu((sender as XtraScrollableControl).VerticalScroll.Value);

        }

        #endregion

        #region 添加锚点

        PanelMenu LastAnchor;

        int LastAnchorIniHeight;

        /// <summary>

        /// 添加锚点

        /// </summary>

        /// <param name="col">默认为控件的Top，Height,Text属性</param>

        /// <param name="LastControl">是否是最后一一个锚点，为了保证最后一个锚点定位在顶部，需要动态设置最后一个锚点的高度，如果最后一个锚点区域高度小于容器高度，则设置其高度为容器高度</param>

        public void AddAnchor(Control col, bool LastControl)

        {

            AddAnchor(col, col.Text, LastControl);

        }

        /// <summary>

        /// 添加锚点

        /// </summary>

        /// <param name="col">默认为控件的Top，Height属性</param>

        /// <param name="Caption">如果Caption为空则取Col的Text属性</param>

        /// <param name="LastControl">是否是最后一一个锚点，为了保证最后一个锚点定位在顶部，需要动态设置最后一个锚点的高度，如果最后一个锚点区域高度小于容器高度，则设置其高度为容器高度</param>

        public void AddAnchor(Control col, string Caption, bool LastControl)

        {

            Label lbl = new Label()

            {

                AutoSize = false,

                Dock = System.Windows.Forms.DockStyle.Top,

                Location = new System.Drawing.Point(, ),

                /*lbl.Size = new System.Drawing.Size(219, 37);*/

                Height = ,

                TabIndex = ,

                Text = Caption,

                TextAlign = System.Drawing.ContentAlignment.MiddleRight,

                Tag = col.Top.ToString()

            };

            IniEventLable(lbl);

            if (LastControl)

            {

                LastAnchor = new PanelMenu(lbl, col);

                LastAnchorIniHeight = col.Height;

                lst.Add(LastAnchor);

            }

            else

                lst.Add(new PanelMenu(lbl, col));

            MenuPan.Controls.Add(lbl);

            MenuPan.Controls.SetChildIndex(lbl, );

        }

        #endregion

        /// <summary>

        /// 根据滚动条位置获得对应的锚点空间

        /// </summary>

        /// <param name="ScrollValue">滚动条的值</param>

        /// <returns></returns>

        public Label GetMenu(int ScrollValue)

        {

            Label lbl = null;

            foreach (PanelMenu menu in lst)

            {

                if (menu.Top <= ScrollValue && menu.Buttom > ScrollValue)

                    lbl = menu.Label;

            }

            if (lbl == null)

            {

                return null;

            }

            return lbl;

        }

        /// <summary>

        /// 初始化锚点的事件

        /// </summary>

        /// <param name="lbl"></param>

        void IniEventLable(Label lbl)

        {

            lbl.MouseEnter += lbl_MouseEnter;

            lbl.MouseLeave += lbl_MouseLeave;

            lbl.MouseClick += lbl_MouseClick;

        }

        #region 锚点单击

        Label _CurrentLable;

        public Label CurrentLable

        {

            set

            {

                if (value == null) return;

                if (_CurrentLable == value) return;

                value.BackColor = Color.LightPink;

                if (_CurrentLable != null)

                    _CurrentLable.BackColor = Color.Transparent;

                _CurrentLable = value;

            }

            get { return _CurrentLable; } //{ return CurrentLable; }

        }

        /// <summary>

        /// 鼠标点击

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        void lbl_MouseClick(object sender, MouseEventArgs e)

        {

            if (e.Button == MouseButtons.Left)

            {

                CurrentLable = sender as Label;

                XSControl.VerticalScroll.Value = int.Parse((sender as Label).Tag.ToString()) - CurrentLable.Top;

            }

        }

        /// <summary>

        /// 设置鼠标进入时背景色

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void lbl_MouseEnter(object sender, EventArgs e)

        {

            if ((sender as Label) != CurrentLable)

                (sender as Label).BackColor = Color.FromArgb(0xFF, 0xFF, 0x99);

        }

        /// <summary>

        /// 鼠标移出，还原背景色

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void lbl_MouseLeave(object sender, EventArgs e)

        {

            if ((sender as Label) != CurrentLable)

                (sender as Label).BackColor = Color.Transparent;

        }

        #endregion

    }

    public class PanelMenu

    {

        public PanelMenu(Label label, Control anchorContainer)

        {

            Label = label;

            AnchorContainer = anchorContainer;

            Top = anchorContainer.Top;

        }

        public PanelMenu(Label label, int top, int height)

        {

            Label = label;

            Top = top;

            Height = height;

        }

        /// <summary>

        /// 锚点定位的容器对象，通常是Panel

        /// </summary>

        public Control AnchorContainer { get; set; }

        /// <summary>

        /// 锚点，Lable

        /// </summary>

        public Label Label { get; set; }

        public int Top

        {

            get;

            set;

        }

        private int _height;

        public int Height

        {

            get

            {

                if (AnchorContainer != null)

                    return AnchorContainer.Height;

                else

                    return _height;

            }

            set { _height = value; }

        }

        public int Buttom { get { return Top + Height; } }

    }

AnchorPanel APanel;

       private void Form3_Load(object sender, EventArgs e)

       {

           APanel = new AnchorPanel(panel1, xtraScrollableControl1);

           labelControl1.Text = groupControl6.Height.ToString();

           if (groupControl6.Height < xtraScrollableControl1.Height)

               groupControl6.Height = xtraScrollableControl1.Height;

           panel1.Controls.Clear();

           APanel.AddAnchor(groupControl1, false);

           APanel.AddAnchor(groupControl2, false);

           APanel.AddAnchor(groupControl3, false);

           APanel.AddAnchor(groupControl4, false);

           APanel.AddAnchor(groupControl5, false);

           APanel.AddAnchor(groupControl6, true);

           APanel.CurrentLable = APanel.GetMenu();

       }