Wpf Dockfill在mstsc activeX控件中不工作

我正在尝试在WPF中创建rdp。我使用AxMSTSCLib库在wpf应用程序中创建rdp客户机。我计划创建一个承载rdp的usercontrol。 但是我可以看到windows主机的灰色区域。我需要根据windows主机的大小填充rdp客户端

 public partial class RDPUserControl : UserControl
    {
        internal RDPActiveXControl _rdp;
        internal string Servername { get; set; }
        internal string Username { get; set; }
        internal string Password { get; set; }
        internal TabItem TabItem { get; set; }
        public RDPUserControl()
        {
            InitializeComponent();
        }
 
        private void InitData()
        {
            _rdp = new RDPActiveXControl();
            ((System.ComponentModel.ISupportInitialize)(_rdp)).BeginInit();
            _rdp.Name = "rdp";
            _rdp.Enabled = true;
            wfHost.Child = _rdp;
            ((System.ComponentModel.ISupportInitialize)(_rdp)).EndInit();
        }

        internal void Connect()
        {
            _rdp.Server = Servername;
            _rdp.UserName = Username;
            _rdp.AdvancedSettings7.ClearTextPassword = Password;
            _rdp.ColorDepth = 24;
            _rdp.AdvancedSettings7.SmartSizing = true;
            _rdp.AdvancedSettings7.AuthenticationLevel = 2;
            _rdp.AdvancedSettings7.EnableCredSspSupport = true;
            _rdp.Width = Convert.ToInt32(this.ActualWidth);
            _rdp.Height = Convert.ToInt32(this.ActualHeight);
            _rdp.DesktopWidth = Convert.ToInt32(this.ActualWidth);
            _rdp.DesktopHeight = Convert.ToInt32(this.ActualHeight);
            _rdp.OnDisconnected += _rdp_OnDisconnected;
            try
            {
                _rdp.Connect();
            }
            catch(Exception e)
            {
                MessageBox.Show("Connection Failed: "+e.Message);
            }
        }

        private void _rdp_OnDisconnected(object sender, AxMSTSCLib.IMsTscAxEvents_OnDisconnectedEvent e)
        {
            MainWindow window = Application.Current.MainWindow as MainWindow;
            Page page = window._mainFrame.Content as Page;
            ConnectionsPage connectionPage = page as ConnectionsPage;
            connectionPage.CloseTab(TabItem);
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            InitData();
            Connect();
        }

如何将RDP ActiveXControl设置为windowsFormHost的完整大小

我试过了

_rdp.Dock = System.Windows.Forms.DockStyle.Fill;

但它会使应用程序消失。有人知道这有什么问题吗？。任何工作示例都会有所帮助

_rdp.Dock = System.Windows.Forms.DockStyle.Fill;