private void AddNewAgent()
        {
            var apw = new AddPersonWindow();

            apw.AddType = "Agent";
            apw.Title   = "Add a new Agent to the database";
            apw.Show();
        }
        private void AddNewBuyer()
        {
            var apw = new AddPersonWindow();

            apw.AddType = "Buyer";
            apw.Title   = "Add a new Buyer to the database";
            apw.Show();
        }