New Post: AvalonDock: How to assign a parent to a Hidden item that doesn't have a parent by default

I have a scenario where in my default layout for my dock, I have a few LayoutAnchorable items in LayoutRoot.Hidden. These don't have any parent because I don't want them to be visible until the user explicitly enables them.

The problem I'm having is I can't seem to figure out how to move it from being Hidden to being rooted to a new floating window, or (for example) the BottomSide group.

Are there any samples on how to do something like this?