'Checks the explicit staff lock box if value is true, otherwise selects "visible".'

@is_explicitly_locked.setter
def is_explicitly_locked(self, value):

    self.ensure_staff_lock_visible()
    if (value != self.is_explicitly_locked):
        self.find_css('#staff_lock').click()
    EmptyPromise((lambda : (value == self.is_explicitly_locked)), 'Explicit    staff    lock    is    updated').fulfill()
