In case you are trying to Host a WPF control in a Windows Form Application the sample in the SDK isn't rendering due to the fact it attempting to put the control in a panel. The sample has also changed the default control from a page to Grid - this is required! (see XAML below).
In either case i thought i would post a simple sample.
Note the references the live in: C:\Program Files\Reference Assemblies\Microsoft\WinFx\v3.0
ctrlHost.Child = avAddressCtrl2;