public Explorer() { super(new DynamicNode(ROOT)); PropertiesSet preferences = PropertiesManager.getPreferencePropertiesSet(); if (preferences != null) { preferences.addPrefixPropertyChangeListener( DisplayToolTipsOptionGroup.class, DisplayToolTipsOptionGroup.TOOLTIPS_FIELD_VISIBILITY_PREFIX, new PreferencesListener()); Db.addDbListener(dbslistener); tooltipsFields.addAll(Arrays.asList(DisplayToolTipsOptionGroup.getAvailableMetaFields())); } }