Execute instructions before JTabbedPane change of tabulation

I use JTabbedPanes,
in one of them the user can do operations that need to be saved (JButton Save).
But if he choose another Tabulation without saving everything is lost.
How can I ask the user to save the operations before the JTabbedPane change of Tabulation ?
Thank you for any help.
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>>everything is lost.

Why so?

You could use a ChangeListener, but at the moment, i don't see why you need to

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matthew016Author Commented:
That's the way my programs works.
I can't really explain this shortly.
But in my tabulations I have JPanels but they have not the method addChangeListener.
matthew016Author Commented:
I see that I can use ComponentListener
componentHidden(ComponentEvent e)
componentShown(ComponentEvent e)
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matthew016Author Commented:

Ok I have several problems when I use a ComponentListener:

1.The event is called after the tab is changed, so I have my JOptionPane above the new tab clicked.

2.I tought I could ask the user to Save with options Yes, No, Cancel
   And when he clicks cancel the tab shouldn't change, do u think it is possible to do that ?
It's difficult to assist you only knowing the vaguest details. Suffice it to say at this stage that it's possible to autosave continuously, which i would imagine would cure the problem
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