You shouldn't really have a need for one since the info re the state of the check box is being recognised on init. To refresh while the dialog is open just use
On ^*:MODE:#:if ($dialog(test)) $dioc(%channel)
Are you sure you want to unfollow this person?
Are you sure you want to delete this?
Click "Unsubscribe" to stop receiving notices pertaining to this post.
Click "Subscribe" to resume notices pertaining to this post.