JPopupMenu : how can I know when the mouse leaves the popup?

Hello,
I need to know when the mouse leaves a JPopupMenu or more precisely when no items are overlighted. Adding a mouselistener to the popup does not work because the JMenuItems themselves capture the mouse.

Actually, I added a MouseListener that extends MouseAdapter to the component that owns the popup, and the same MouseListner to the popup itself. I have only overriden the MouseEntered method to let me know that the mouse is no more over a JMenuItem. It's now working fine, but I don't like that kind of programming.....
I need that to do a toggleButton with a popup menu that would remember the last item selected when the mouse leaves the popup. (Because once a choice is made, the selected "tool" appears as an icon in the button and that icon is updated when the items of the popup are overlighted. So that when the mouse leaves the popup, the selected tool has to reappear as an icon in the button and the associated item has to be armed.)

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JPopupMenu : how can I know when the mouse leaves the popup?

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