If there exist special custom editor for property, there appears small
"..." button which invokes such custom editor dialog. Custom editor is embedded
in a dialog which contains Default, OK and Cancel buttons, combo box enabling
to change editor (e.g. PointEditor/Form Connection). Custom editor operator contains
high-level methods to get or set compound property value in one method by
custom editor. These methods are then used in tests or in specialized property
implementation (see {@link org.netbeans.jellytools.properties}).