MonitorListener monitorListener = new MonitorListener(element, canvas, diagram, substitutions);
if (mappedElement != null) {
MonitorListener oldListener = mappedElement.getHint(KEY_VARIABLE_LISTENER);
MonitorListener monitorListener = new MonitorListener(element, canvas, diagram, substitutions);
if (mappedElement != null) {
MonitorListener oldListener = mappedElement.getHint(KEY_VARIABLE_LISTENER);