selecting and deselecting items in a selection-list

[Bill]

So in a default selection-list you can select an item then click 'Ctrl' and select more. I was wondering if there is a way to have clicking an item in a selection-list select it or deselect it depending on if it's already selected, no matter if other items are selected. In short get away from using the 'Ctrl' key. Thanks!!

using 10.2b

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