Use NON selected items in Multiple Select Listbox

[SeBasTiaan]

Hello,

Does anybody know if there's a way to use the NOT selected items in a multiple select listbox?

The selected items are put into a txtbox (A) but I want the unselected items to be put in txtbox (B). Is that possible?

The multiple select listbox is updated by an cbobox.

Thanks allready for your time.

Regards, Bas