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And I assume `SecondView`has the same structure as `FirstView`where you also inject your `MenuView` but has different contents for `left, center,right`. Depending on how much freedom you have for changing the structure, and what other constraints you have, it seems like you could create a `MainView`   as a `vbox`  with 2 elements, the top one containing your menu and the bottom one holding the content that is specific to FirstView, SecondView, etc. So when you go to SecondView you just change the contents in the bottom cell of your vbox.