org.zkoss.zul.listbox.checkmarkDeselectOthers

Default: false
[Since 5.0.5]

If a listbox's checkmark (Listbox.isCheckmark()) is enabled, the selection will be toggled when an user clicks an item. In other words, all other items will remain the same.

If you prefer to deselect all other items and select the item being clicked (which the behavior of ZK 5.0.4 and earlier), you could specify true to this library property.