Notes:
If that property triggers side effects, then it should not be used.
If that property is enabled, then EnableAsyncUpdateAllTabs and EnableReloadingUnselectedTab properties have no effect and dynamic UpdatePanels are created.
It is not recommended to modify that property within a posback, because it will trigger recreation of templates in all tab items, which may slow down performance.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2