If you try to embed a morph into a system window, from the 
halo menu or sending a embedInWindow,  it will go very wrong. 
In addMorph:fullFrame: the morph get's modified and the 
result is not very nice.
I suspect that some modification from the alternativeWindowLook
is to blame. It seems like the method is used both for 
constructing windows and adding new morphs to a window.

Karl