Hints image on the animation panel does not change.

Question

Help I have several animation panels when the program initializes from the constructor. I have a separate AnimationPanel class that creates each panel for display. The initial ?hello ? welcome panel (from the constructor) animates on the main panel when the program begins.
The problem is I want to have different animation panels (that are stored ) to animate and replace the main panel animation at a push of a button. While, the various panels can animate if called from the constructor, they do not animate when called from a button.
The buttons I created to switch the main animated panel with a different one seems to work to the extent that it gets the correct music, but the image on the animation panel does not change.
I know this is a more in depth of a question but might you be able to give me a point in the right direction?
Here is the code from the constructor that works fine in the constructor to start the main animation.
public PingPong()
// null layout because it has a main panel where this display panel is placed
super(null);
//panels are created
instantiatePanels();
//panels are added to the main content pane
placePanelsOnView();
startAnimation();
initializeAudio();

Answer 1

The problem is that I now start it with no animation to begin with and just an empty panel, but still when I try to add an animation from the button and it will not start. The contentPane is in a different class that places the buttons and the view together.
Here is the code that the button calls back with a getNextPanel() :
AnimatedPanel expertPingPongPlayerPanel
          = new AnimatedPanel( );
add(expertPingPongPlayerPanel );
     expertPingPongPlayerPanel.animate();
          expertPingPongPlayerPanel.setVisible(true);
          startAnimation();