.addSelectionChangedListener(new ISelectionChangedListener() {
public void selectionChanged(SelectionChangedEvent event) {
if (event.getSelection() instanceof IStructuredSelection) {
IStructuredSelection sel = (IStructuredSelection) event
.getSelection();
DecoratorDefinition definition = (DecoratorDefinition) sel
.getFirstElement();
if (definition == null) {
clearDescription();
} else {
showDescription(definition);