public void deselectAll() {
        for (int i = 0; i < getItemsSize(); i++) {
            if (isSelected(i)) {
                toggle(i);
            }
        }
    }
Component wrapper for the PrimeFaces {@code p:selectManyCheckbox}.
primefaces-selenium/primefaces-selenium-components/src/main/java/org/primefaces/selenium/component/SelectManyCheckbox.java