How to close a JFrame

[valery]

When I offer a prompt to close a window (JFrame), and the user chooses No or Cancel, I am using the following:

Code:

  
        setVisible(false);
        dispose();

but the window disappears, and a blank square overlays the main window and buttons.
I don't want that
Do you have any ideas to solve this?

[gabriel]

Try revalidate() or invalidate()/validate() + repaint() on your main window.