The subTabLayout region has a child called “subTabs” that takes a subTabBar bean.
subTabBar bean contains link elements as its indexed children. subTabBar is rendered once on top.
The number of indexed children of subTabBar, which are the link elements, should be equal to the number of indexed children of the parent subTabLayout.
The link elements are used to switch between the indexed children of the subTabLayout.
Corresponding web bean: OASubTabLayoutBean