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Derived classes can override this method if they need to do additional cleanup. However, they should also call the base implementation to ensure that all resources are freed. The base implementation does fairly substantial work to free resources that are known to the base class.
If a window is being hosted, it will be destroyed.
The calling thread must be the same as the dispatcher.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)