DevExpress.XtraBars.Docking.DockPanel如何用代码控制隐藏打开

Question

this.dockPanel_win.Visibility = DevExpress.XtraBars.Docking.DockVisibility.AutoHide；我把这个控件自动隐藏，然后使用
this.dockPanel_win.Visibility = DevExpress.XtraBars.Docking.DockVisibility.Visible； 报错！！请教高手 解决！！  很急   谢谢！！！

Answer 1

            if (BtnWork.Caption == "隐藏工作窗口(Ctrl+W)")
            {
                BtnWork.Caption = "显示工作窗口(Ctrl+W)";
                dockPanel.Visibility = DockVisibility.Hidden;
            }
            else if (BtnWork.Caption == "显示工作窗口(Ctrl+W)")
            {
                BtnWork.Caption = "隐藏工作窗口(Ctrl+W)";
                dockPanel.Visibility = DockVisibility.Visible;
}

Answer 2

试了下，没有发现丝毫问题！！
    public partial class XtraForm3 : DevExpress.XtraEditors.XtraForm
    {
        public XtraForm3()
        {
            InitializeComponent();            this.dockPanel1.Visibility = DevExpress.XtraBars.Docking.DockVisibility.AutoHide;
        }        /// <summary>
        /// show
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void simpleButton1_Click(object sender, EventArgs e)
        {
            dockPanel1.Visibility = DockVisibility.Visible;
        }        /// <summary>
        /// hidden
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void simpleButton2_Click(object sender, EventArgs e)
        {
            dockPanel1.Visibility = DockVisibility.Hidden;
        }

Answer 3

                if (this.Parent != null)
                {
                    Form f = this.Parent.FindForm();
                    DevExpress.XtraBars.Docking.DockPanel dp = (DevExpress.XtraBars.Docking.DockPanel)f.Controls["dockPanel_win"];
                   if (dp.Visibility == DevExpress.XtraBars.Docking.DockVisibility.AutoHide && f.MdiChildren.Length == 1)
                    {
                        //展开导航栏
                        dp.Visibility = DevExpress.XtraBars.Docking.DockVisibility.Visible;
                    }                
}