Let us execute the application by selecting Build and Run. We get a view of the
RootViewController, as shown in the following image (a) with the list of existing customers. We select the Bar Button Item with the title: Master Product Information in the toolbar at the bottom as we are interested in entering the information of the master products. We get a view as shown in the following image (b). The view contains a toolbar with three Bar Button Item controls with the text: Customers List, Edit, and Add respectively.
The function of the three Bar Button Item controls is as follows: