labelProvider = new BookmarksLabelProvider();
bookmarksTree.setLabelProvider(labelProvider);
bookmarksTree.setSorter(new ViewerSorter());
bookmarksTree.setInput(bookmarksProvider);
bookmarksTree.setAutoExpandLevel(2);
bookmarksTree.addDoubleClickListener(new BookmarkAction());
bookmarksTree.addDoubleClickListener(new IDoubleClickListener(){
public void doubleClick( DoubleClickEvent event ) {
final Object obj = ((IStructuredSelection) bookmarksTree.getSelection())
.getFirstElement();