Selektieren im IBM Notes Client funktioniert nicht (mit Eclipse SWT)

public class ShelfView extends ViewPart   {


   public static final String ID = ShelfView.class.getName();


   private Label label;


   private ISelectionListener _listener = new ISelectionListener() {
       public void selectionChanged(IWorkbenchPart sourcePart, ISelection selection) {
           NotesUIWorkspace ws = new NotesUIWorkspace();            
           NotesUIElement elem = ws.getCurrentElement();


           if (elem instanceof NotesUIView) {
               NotesUIView currentView = (NotesUIView) elem;
               NotesUIViewEntryCollection collection = currentView.getActionableEntries();
               Iterator docIterator = collection.documentIterator();


               String txt = "";
               while (docIterator.hasNext()) {
                   NotesUIDocumentEntry entry = (NotesUIDocumentEntry) docIterator.next();
                   for (int i = 0; i < entry.getColumnValues().size(); ++i) {
                       txt = txt + i + ": " + entry.getColumnValueString(i) + "\n";
                   }
                   txt = txt + "UNID: " + entry.getDocumentData().getUnid() + "\nURL: " + entry.getDocumentData().getEditUrl() + "\n";                  
               }


               label.setText(txt);
               label.pack();
           }
       }
   };


   public ShelfView()
   {
   } 


   public void createPartControl(Composite parent)
   {    
       Composite comp = new Composite( parent, SWT.NONE );
       comp.setLayout(new GridLayout());
       label = new Label(comp, SWT.NONE );
       label.setText("Start...");


       getViewSite().getPage().addPostSelectionListener(_listener);
   }


   public void setFocus()
   {
   } 
}