def METHOD_NAME(symbol, event):
    component = symbol.getComponent()
    component.getSymbolByID("PAC_HEADER").setEnabled(event["value"])
    component.getSymbolByID("PAC_SOURCE").setEnabled(event["value"])
    component.getSymbolByID("PAC_SYS_DEF").setEnabled(event["value"])
    Database.setSymbolValue("core", pacInstanceName.getValue() + "_CLOCK_ENABLE", event["value"], 1)