private void FacebookButton_Click(object sender, RoutedEventArgs e)
        {
            WriteableBitmap screenshot = new WriteableBitmap((int)CompleteTable.ActualWidth, (int)CompleteTable.ActualHeight);
            screenshot.Render(CompleteTable, null);
            screenshot.Invalidate();
            fileName = "FIFA_World_Cup_2014_Predictor" + DateTime.Now.Ticks + ".jpg";
            var myStore = IsolatedStorageFile.GetUserStoreForApplication();
            IsolatedStorageFileStream myFileStream = myStore.CreateFile(fileName);
            screenshot.SaveJpeg(myFileStream, 4000, 2400, 1, 100);
            myFileStream.Close();
            myFileStream = myStore.OpenFile(fileName, FileMode.Open, FileAccess.Read);
            MediaLibrary library = new MediaLibrary();
            library.SavePicture(fileName, myFileStream);
            ShareMediaTask shareMediaTask = new ShareMediaTask();
            shareMediaTask.FilePath = fileName;
            shareMediaTask.Show();
        }