private async void LogOut()
        {
            bool res = await _connector.DoLogoutAsync();

            _connector = null;

            _isLoggedIn = false;

            LogMessage("Logged out ...");
        }
        private async void bLogout_Click(object sender, EventArgs e)
        {
            bLogout.Enabled = false;

            bool res = await _connector.DoLogoutAsync();

            _connector = null;

            _isLoggedIn = false;

            this.Text = "ADN ReCap Demo - Logged out";

            LogMessage("Logged out ...");

            _TreeViewScenes.Nodes.Clear();
        }