API Reference > ui-components > Tree > TreeEvents > onCheckboxStateChanged onCheckboxStateChanged MethodOptional Called when checkbox states for nodes are changed. If Subscription is returned it can be used to stop event handling by calling unsubscribe(). onCheckboxStateChanged(event: TreeCheckboxStateChangeEventArgs): undefined | Subscription Parameter Type Description event TreeCheckboxStateChangeEventArgs Returns - undefined | Subscription Last Updated: 12 June, 2024