How to lock listbox default selected item

[#1]

I've got a listbox where a item is selected by default onloading. Is there a way that I can lock the default item so it will always be selected and not affected by selections in other listboxes?

[#2]

Use the Lock functionality. Select the Listbox and click on Lock or use Ctrl+L. It must be unlocked for it to be changed.

You could also do an Action, OnAnySelect, Select your value. Lock may be a better choice, if it works.