Cannot transform top-level views when they are linked to other views
I am not sure when this crept in, but I was reading the 4.1 performance guide, which mentioned that it is a good idea to convert Panels to containers if you are not using Panel-specific features. I am not able to transform any of my top-level views; the menu is simply not there.
If your top level views have been linked, we disable transformations.
This prevents the situation where it was valid when you dragged it into the container but then may become invalid after the transform. We had this bug reported internally and have it on the list of things to fix as a low priority.