This is an example that applies some features of the combo
box control. We will simulate a small business that sells ice cream.
An ice cream order is represented by a flavor, a type of container, an
ingredient if any, and the number of scoops.
When a customer places an order, the clerk will select
the date and the time the order was processed. Then the composition of the
order as specified by the customer will also be selected. After making
these selections, the employee will calculate the price of the order.