private void DataWordsForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            var original = wm.GetWords(Manager.Level.Hard, false).ToArray();
            var current  = lsbWords.Items.Cast <string>().OrderBy(w => w).ToArray();

            if (current.Length == 0)
            {
                return;
            }
            var change = original.Count() != current.Count() || current.Count(c => !original.Contains(c)) > 0 || original.Count(o => !current.Contains(o)) > 0;

            if (change && MessageBox.Show("Deseja salvar as alterações?", "Atenção", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                wm.SaveWords(current);
            }
        }