The ViewProperty attribute, which is set on various view properties, determines how or if the view property on which it is set can be accessed through a ViewBinding. If set to None or if the attribute is not set at all, the property cannot be accessed through a ViewBinding. If set to ViewOnly, the property will be accessible through a ViewBinding. Setting the ViewProperty attribute to Routed or RoutedNoFallback, allows an attached property to be accessed through a ViewBinding.