@Override
 public void panelDeactivated() {
   Logger.getLogger(OscillogramNavigatorPanel.class.getName()).log(Level.INFO, "pd");
   this.result.removeLookupListener(this);
   this.result = null;
   ExplorerUtils.activateActions(manager, false);
 }
 @Override
 public void panelActivated(Lookup lkp) {
   Logger.getLogger(OscillogramNavigatorPanel.class.getName()).log(Level.INFO, "pa");
   this.result = Utilities.actionsGlobalContext().lookupResult(ChannelList.class);
   this.result.addLookupListener(this);
   ExplorerUtils.activateActions(manager, true);
   resultChanged(new LookupEvent(result));
 }