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copied!<p>As pajton noted in a previous comment, Popup is not a JComponent to which listeners can be readily bound. But, as its documentation states, "implementations of Popup are responsible for creating and maintaining their own Components to render [its subject] to the user."</p> <p>So in using it as your presentation mechanism, your Popup is going to have to present itself as an actual Swing component <em>anyway</em>. Have it register <em>itself</em> to that component. Have it hide itself when the component loses focus.</p> <pre><code>import java.awt.FlowLayout; import java.awt.Frame; import java.awt.Point; import java.awt.event.ActionEvent; import java.awt.event.WindowEvent; import java.awt.event.WindowFocusListener; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.Popup; public class PopupTester extends JFrame { private static class MessagePopup extends Popup implements WindowFocusListener { private final JDialog dialog; public MessagePopup(Frame base, String message) { super(); dialog = new JOptionPane().createDialog( base, "Message" ); dialog.setModal( false ); dialog.setContentPane( new JLabel( message ) ); } @Override public void show() { dialog.addWindowFocusListener( this ); dialog.setVisible( true ); } @Override public void hide() { dialog.setVisible( false ); dialog.removeWindowFocusListener( this ); } public void windowGainedFocus( WindowEvent e ) { // NO-OP } public void windowLostFocus( WindowEvent e ) { hide(); } } public static void main(String[] args) { final PopupTester popupTester = new PopupTester(); popupTester.setLayout(new FlowLayout()); popupTester.setSize(300, 100); popupTester.add(new JButton("Click Me") { @Override protected void fireActionPerformed(ActionEvent event) { Point location = getLocationOnScreen(); MessagePopup popup = new MessagePopup( popupTester, "Howdy" ); popup.show(); } }); popupTester.add(new JButton("No Click Me")); popupTester.setVisible(true); popupTester.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } </code></pre>

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