JPanel that close the parent JFrame

Hello.
I'm puzzled... how can I close a JFrame from the JPanel it contains?
I mean:
I have a Form that extends JFrame. In this form there's a JPanel, which has a BorderLayout. In the South part of the BorderLayout there's a JPanel (BoxLayout) that contains a JButton.
I'd like this JButton to get disposed of the Form.
How should I?
Is there a better way to manage with this?
(putting the button somewhere else...)
Thank you

Sorry, I forgot to mention that my sub-panel is in another class, another file.
So I don't know how to call the parent frame.
I tried with some .getParent(), but I get
JPanel
JLayerPane
JRootPane
and no JFrame.
I could just put everything into 1 single class (or inner classes at least), but if there's a chance to keep them in different files, I would be glad to learn about it :)
Thank you.

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JPanel that close the parent JFrame

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