Say, there's a frame F0 with an owned window. There's also a frame F1.
When F1 is active and the window is clicked it does receive focus, all the
focus/activation events generated are correct, though the frame F1 remains
natively active (has a highlighted title), while the frame F0 should actually
become such.

Here's the test case:

import java.awt.*;
import java.awt.event.*;
import java.awt.event.AWTEventListener;

public class Test {
    public static void main(String[] args) {
        
        Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
            public void eventDispatched(AWTEvent e) {
                System.err.println(e);
            }
        }, FocusEvent.FOCUS_EVENT_MASK |
           WindowEvent.WINDOW_FOCUS_EVENT_MASK |
           WindowEvent.WINDOW_EVENT_MASK);
        
        Frame f0 = new Frame("f0");
        Frame f1 = new Frame("f1");
        Window w = new Window(f0);
        Button b = new Button("button");
        
        f0.setBounds(0, 0, 100, 100);
        f1.setBounds(300, 0, 100, 100);
        w.setBounds(0, 300, 100, 100);
        w.add(b);

        f1.setVisible(true);        
        f0.setVisible(true);
        w.setVisible(true);
    }
}