// types the key to the focused element.
    // example usage:
    //    dynamic tbox = webView.getElementById('id');
    //    tbox.focus();
    //    webView.TypeKey(VirtualKey.SPACE, " ");
    public static void TypeKey(this IWebView webView, VirtualKey vk, string chr)
    {
        WebKeyboardEvent keyEvent = new WebKeyboardEvent();

        keyEvent.Type = WebKeyboardEventType.KeyDown;
        keyEvent.VirtualKeyCode = vk;
        webView.InjectKeyboardEvent(keyEvent);

        keyEvent.Type = WebKeyboardEventType.Char;
        keyEvent.Text = chr;
        webView.InjectKeyboardEvent(keyEvent);

        keyEvent.Type = WebKeyboardEventType.KeyUp;
        keyEvent.VirtualKeyCode = vk;
        webView.InjectKeyboardEvent(keyEvent);
    }