How to open Navigator panel programmatically?

Hello,

I wonder how to activate navigator panel programmatically. My current 
code is:


/**
  *
  * @author peter
  */
public class FormDataOpenAction extends OpenAction {

     private final OpenAction action;

     public FormDataOpenAction() {
         action = SystemAction.get(OpenAction.class);
     }

     @Override
     public String getName() {
         return "Open";
     }

     @Override
     protected void performAction(final Node[] activatedNodes) {
//        Mode mode = WindowManager.getDefault().findMode("navigator");
//        TopComponent[] navComponents = mode.getTopComponents();
//        if (navComponents.length > 0) {
//            navComponents[0].requestActive();
//        }
         super.performAction(activatedNodes);
         NuclosLayoutNavigatorPanel panel = 
NuclosLayoutNavigatorPanel.getInstance();
         NavigatorHandler.activateNavigator();
         NavigatorHandler.activatePanel(panel);
     }
}

If I remove the comments, the project panel is selected (obviously 
because it is the first one shown in that "mode").

I'd like to find the panel and open it, eventually also creating the 
TopComponent if not already done.

The code related to NavigatorHandler does not seem to work.

Kind regards
Peter