The isTopLevel property (Boolean) has been added to the global Developer and Enterprise Sample portal display profile documents. The isTopLevel property is, by default, set to true for the following containers and providers.
JSPDynamicSingleContainer, JSPTableContainer, JSPDynamicSingleContainer, JSPTabContainer, FrameTabContainer, WirelessDesktopDispatcher, WirelessTemplateContentChannel, TemplateNativeContainer, JSPNativeContainer, VoiceJSPDesktopContainer, JSPRenderingContainer, and ASCTabContainer
JSPTabContainerProvider, TemplateTableContainerProvider, TemplateTabContainerProvider, DynamicAggregationContainerProvider, WirelessDesktopDispatcherProvider, WirelessTemplateDesktopProvider, WirelessTemplateContentProvider, WirelessJSPDesktopProvider, and JSPRenderingContainerProvider