ActiveX Failure

I am designing an ActiveX control that requires that the container supports a certain interface (in this case, the IOleInPlaceSiteWindowless interface that supports windowless/"lightweight" controls). How can I cause the initialization to fail if a non-friendly container tries to load it?

What Happens if you try to load the control into a non freindly contaner at the moment, I'm assuming it fails in some way, could you expand on that.