A working tabbed panel built from two primitives: AjaxUpdateContainer (the
content region) and AjaxUpdateLink (the tab clicks). The selected tab is just a field on
the component; a click sets it and updates the container, which re-renders the strip (highlighting the
active tab) and the matching panel. No JavaScript, no child components, no AjaxTabbedPanel.
The big picture. This panel shows because selectedTab equals "Overview".
Currently selected: Overview