private async void Button_Click_1(object sender, RoutedEventArgs e)
{
Video v = new Video();
var frame = (Frame)Window.Current.Content;
var page = (MainPage)frame.Content;
var token = await page.LoginControl.GetToken();
string result = await v.AddComment((DataContext as Entry).media_group.yt_videoid.t,
CommentBox.Text, token);
comments((DataContext as Entry), token);
CommentBox.Text = string.Empty;
}