+bool Plant::set_open(const std::string& element, bool open) {
+#ifdef DEBUG
+ cerr << __FILE__ << "(" << __LINE__ << ")"
+ << ": set_open(element = " << element <<
+ ", open = " << open << ")." << endl;
+#endif // DEBUG
+ Glib::Mutex::Lock lock(simulator_mutex);
+ return simulator.set_open(element, open);
+}
+