private void DownButton_Click(object sender, RoutedEventArgs e)
{
ConcatItem item = (ConcatItem)concatGrid.SelectedItem;
int index = concatGrid.SelectedIndex;
Debug.Assert(index >= 0 && index < ConcatItems.Count - 1);
ConcatItems.RemoveAt(index);
ConcatItems.Insert(index + 1, item);
concatGrid.SelectedIndex = index + 1;
}
private void UpButton_Click(object sender, RoutedEventArgs e)
{
ConcatItem item = (ConcatItem)concatGrid.SelectedItem;
int index = concatGrid.SelectedIndex;
Debug.Assert(index > 0);
ConcatItems.RemoveAt(index);
ConcatItems.Insert(index - 1, item);
concatGrid.SelectedIndex = index - 1;
}
