You are debugging an MAF application. The application stores the total cost of items in the user's shopping cart in a managed bean variable. The total cost is then displayed in an AMX page via an amx:outputText component. A button is pressed on the page to add another item to the shopping cart, and, as a result, the total cost value is changed in the managed bean. However, you notice that the value is not changed in the AMX page.
Which is the reason for this behavior?