private void BlacklistDetails_btn_Click(object sender, RoutedEventArgs e)
        {
            Button senderButton = sender as Button;

            if (senderButton.DataContext is Volunteer)
            {
                Volunteer vol       = (Volunteer)senderButton.DataContext;
                var       Blacklist = new BlackList(vol);
                Blacklist.Show();
            }
        }
        private void BlacklistDetails_btn_Click(object sender, RoutedEventArgs e)
        {
            Button senderButton = sender as Button;

            if (senderButton.DataContext is Volunteer)
            {
                Volunteer Vol = (Volunteer)senderButton.DataContext;
                if (Vol != null)
                {
                    var bl = new BlackList(Vol);
                    bl.Show();
                    bl.Owner = this;
                }
            }
        }