private void listToolStripMenuItem_Click(object sender, EventArgs e)
        {
            InsertListDialog dlgInsertList = new InsertListDialog();

            if (dlgInsertList.ShowDialog() == DialogResult.OK)
            {
                builder.InsertList(dlgInsertList.Ordered, dlgInsertList.ListType,
                                   dlgInsertList.ListItems);
            }
        }