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We (among all forums) thank you in advance

Why not? What did you try? What happened? ...Post the code so we can filter through it.

Yes, use a method. Again post what you have tried, what happened, and what you want to happen.

The class responsible for displaying panels should have a method to change it's state, (switch panels). This method would be invoked when the time comes to switch panels. Call the method from where...