What I'd like to do is if specified items are selected and then the check box on any one of the items is checked, check all unchecked items or uncheck all checked items. Hopefully that makes sense, attached is a sample mockup of the non-working code, AutoIT Version 3.3.6.1: How do I capture the event and make it cycle through all items to make it check or uncheck all selected items? The last multiselect topic I found are all from 2007 or earlier and I'm not sure if they apply anymore. Th