Adding a Collection of Child <apex:panelBarItem> Components to an <apex:panelBar> Component
An <apex:panelBar> component can only have <apex:panelBarItem> child components. Sometimes, though, you want to add a collection
of child components. For example, you may want to add an item for
each contact associated with an account. You can do this by wrapping <apex:panelBarItem> in an <apex:repeat> component, as follows:
Note
For this page to display account data, the ID of a valid account
record must be specified as a query parameter in the URL for the page.
For example: https://Salesforce_instance/apex/myPage?id=001D000000IRosz