private void OverviewButton_Click(object sender, RoutedEventArgs e)
{
OverviewGrid.Visibility = Visibility.Visible;
CommentsGrid.Visibility = Visibility.Collapsed;
OverviewButton.Foreground = new SolidColorBrush(Windows.UI.Colors.Black);
CommentsButton.Foreground = new SolidColorBrush(Windows.UI.Colors.Gray);
}