private static void OnSelectedAreaHeightChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            UWebView control = sender as UWebView;

            control.Height = (double)e.NewValue;
        }
        private static void OnSelectedUrlChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
        {
            UWebView control = sender as UWebView;

            control.webview.Url = (String)e.NewValue;
        }