Dealing with fixed components on screen with a constant dynamic section

What is the best way to deal with the case where in your screen you have some main components (top label and always 3 buttons) and the middle section of your screen changes, sometimes it might be a list, others some text etc etc.
Is it possible to have a container in the middle and just change those containers?
Right now I have a list and I am trying to destroy the list and call just a label there… But I am not being able to do it…
Anyone has an idea how to deal with this issue?

I would create three containers, position them appropriately, and then just add/remove objects to/from the middle container.

If you have limited RAM it can be done without the containers; you just have to do more manual positioning and sizing of the objects.

What have you tried so far? Can you share a code snippet?