@Override
        public String toString() {
            return "MVSKey{" +
                    "viewId='" + viewId + '\'' +
                    ", clientId='" + clientId + '\'' +
                    '}';
        }
Gets multiview state attached to a component in a specific view.

@param viewId viewId of a page
@param clientId clientId of a component
@param <T> bean state generic

@return multiview state bean attached to a component or null
primefaces/src/main/java/org/primefaces/PrimeFaces.java