private void Up(object sender, RoutedEventArgs e)
        {
            int index = Lb_Apps.SelectedIndex;

            if (index > 0)
            {
                Appconf tmp1 = al[index];
                Appconf tmp2 = al[index - 1];
                al.RemoveAt(index, false);
                al.Insert(index, tmp2);
                al.RemoveAt(index - 1, false);
                al.Insert(index - 1, tmp1);

                Lb_Apps.Items.RemoveAt(index);
                Lb_Apps.Items.Insert(index, al[index].AppName);
                Lb_Apps.Items.RemoveAt(index - 1);
                Lb_Apps.Items.Insert(index - 1, al[index - 1].AppName);

                Lb_Apps.SelectedIndex = index - 1;
            }
        }