Removing all items scrollbox == destroy?

If I create a list filled with button widgets and then by clicking these buttons removing them from the viewport, does that mean the list itself is gone now, or simply not visible because the buttons are now gone, but actually still in existence the entire time the game is running?
Should I check if I removed the last button and then get the parent and remove it from viewport also?

Is there and if so what is the proper way to destroy the parent list/grid whatnot entirely?
Similar to destroying an actor?
Can someone clarify this for me?