code: private void showHiddenTabPopup() {
  		JPopupMenu menu = new JPopupMenu();
  		if (getMousePosition() == null) {
  			// Startup
  			return;
  		}
  		Collections.sort(this.hiddenTabs, NAME_COMPARATOR);
  		
  		for (Component c : this.hiddenTabs) {
  			if (c instanceof AbstractPanel) {
  				final AbstractPanel ap = (AbstractPanel)c;
  				JMenuItem mi = new JMenuItem(ap.getName());
  				mi.setIcon(ap.getIcon());
  				mi.addActionListener(new ActionListener(){
  					@Override
  					public void actionPerformed(ActionEvent e) {
  						setVisible(ap, true);
  						ap.setTabFocus();
  					}});
  				menu.add(mi);
  			}
  		}
  		menu.show(this, this.getMousePosition().x, this.getMousePosition().y);
  	}
docs: Show a popup containing a list of all of the hidden tabs - selecting one will reveal that tab