def register(self, collector):
        with self._lock:
            self._collectors.add(collector)
Restores the value of the combobox control.
dataset/ETHPy150Open prometheus/client_python/prometheus_client/core.py/CollectorRegistry.register--crossover with--dataset/ETHPy150Open enthought/traitsui/traitsui/wx/history_control.py/HistoryControl._thaw_value