private void Switch(Task <IHTMLBinding> binding, HTMLLogicWindow window, TaskCompletionSource <IHTMLBinding> tcs)
        {
            var oldvm         = Binding?.Root;
            var fireFirstLoad = false;

            Binding = binding.Result;

            if (_CurrentWebControl != null)
            {
                _CurrentWebControl.HTMLWindow.ConsoleMessage -= ConsoleMessage;
                _CurrentWebControl.Dispose();
            }
            else
            {
                fireFirstLoad = true;
            }

            _CurrentWebControl = _NextWebControl;
            _NextWebControl    = null;
            _CurrentWebControl.HTMLWindow.Crashed += Crashed;

            _CurrentWebControl.Show();

            _Window = window;

            var inav = _UseINavigable ? Binding.Root as INavigable : null;

            if (inav != null)
            {
                inav.Navigation = this;
            }
            _Window.State = WindowLogicalState.Opened;

            _Window.OpenAsync().ContinueWith(t => EndAnimation(Binding.Root));

            _Navigating = false;

            FireNavigate(Binding.Root, oldvm);

            tcs?.SetResult(Binding);

            if (fireFirstLoad)
            {
                OnFirstLoad?.Invoke(this, EventArgs.Empty);
            }
        }
        private void Switch(Task <IHTMLBinding> iBinding, HTMLLogicWindow iwindow, TaskCompletionSource <IHTMLBinding> tcs)
        {
            object oldvm = (Binding != null) ? Binding.Root : null;

            Binding = iBinding.Result;

            if (_CurrentWebControl != null)
            {
                _CurrentWebControl.HTMLWindow.ConsoleMessage -= ConsoleMessage;
                _CurrentWebControl.Dispose();
            }
            else if (OnFirstLoad != null)
            {
                OnFirstLoad(this, EventArgs.Empty);
            }

            _CurrentWebControl = _NextWebControl;
            _NextWebControl    = null;
            //_CurrentWebControl.Crashed += Crashed;

            _CurrentWebControl.Show();

            _Window = iwindow;

            var inav = _UseINavigable ? Binding.Root as INavigable : null;

            if (inav != null)
            {
                inav.Navigation = this;
            }
            _Window.State = WindowLogicalState.Opened;

            _Window.OpenAsync().ContinueWith(t => EndAnimation(Binding.Root));

            _Navigating = false;


            FireNavigate(Binding.Root, oldvm);

            if (tcs != null)
            {
                tcs.SetResult(Binding);
            }
        }