So I have a listbox where the user can select multiple items, based on an array made from files in a folder.

Now I need to make an “All”-Item, which should remove the selection from all other items in the list. So basically a selectmode=multiple, with the ability to make that one item exclusive (like shown in the picture below).

Is that possible at all?
two pictures of a tkinter-listbox, side by side. Left one has multiple items selected, the right one has just one selected