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[news.eclipse.tools.gef] Cannot create children for topmost model element

I use successfully StackLayout to let only one child appear from the topmost 
model element (any navigate between them
via the Outline view). Now ContainerEditPolicy.getCreateCommand for my 
topmost model element is never called.
Do I have to install any LayoutPolicy for is (but there is no non-abstract 
LayoutPolicy for StackLayout)?