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How do I allow buttons in one class to set the visibility of other panels in other classes?
panelManager.add(typeSelectionView, TYPEVIEW);

cl.show(panelManager, newPanel);

public class CardLayoutDemo {

  private static JFrame createGUI(){

    JFrame testFrame = new JFrame(  );
    testFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

    List<String> layoutConstraints = Arrays.asList( "first", "second", "third");

    final JPanel contentsPane = new JPanel(  );
    final CardLayout cardLayout = new CardLayout(  );
    contentsPane.setLayout( cardLayout );

    //listener which will be used to switch between the different layouts
    ActionListener listener = new ActionListener() {
      public void actionPerformed( ActionEvent aActionEvent ) {
        String constraint = aActionEvent.getActionCommand();
        cardLayout.show( contentsPane, constraint );
      }
    };

    //add components to card layout with specific constraint
    for ( String constraints : layoutConstraints ) {
      contentsPane.add( new JLabel( constraints ), constraints );
    }

    //create buttons allowing to switch between the different layouts
    JPanel buttonPanel = new JPanel();
    for ( int i = 0; i < layoutConstraints.size(); i++ ) {
      String constraint = layoutConstraints.get( i );
      JButton button = new JButton( "Layout " + i);
      button.setActionCommand( constraint );
      button.addActionListener( listener );
      buttonPanel.add( button );
    }

    testFrame.add( contentsPane, BorderLayout.CENTER );
    testFrame.add( buttonPanel, BorderLayout.SOUTH );

    return testFrame;
  }

  public static void main( String[] args ) {
    EventQueue.invokeLater( new Runnable() {
      public void run() {
        JFrame frame = createGUI();
        frame.pack();
        frame.setVisible( true );
      }
    } );
  }
}