/// <summary>
        /// Method that contains code to open Maintenance window
        /// and close Add window.
        /// </summary>

        private void BackToMaintenance(IClosable window)
        {
            var mainWindow = new MembershipMaintenance();

            mainWindow.Show();
            window.Close();
        }
        // Method for opening Main View and closing Change View.
        private void BackToMaintenance(IClosable window)
        {
            var mainView = new MembershipMaintenance();

            mainView.Show();

            if (window != null)
            {
                window.Close();
            }
        }