You must move (and let hover) mouse over the window, there you can to use Tab to traversing. This is regression against build 86 , there aren't needs to move mouse over window to be possible Tab traversing.

Steps to reproduce:
- create JFrame with two JButton1 and JButton2
- compile and run it
- > mouse isn't over showned window (JFrame)
- hit Tab or Ctrl+Tab
-> nothing happends
-> move mouse let hover window (JFrame)
- now try to hit Tab
-> focus transfered to JButton1 , hit Tab , focus transvered to  JButton2


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This is the test case in the attachments: 

import java.awt.*;
import javax.swing.*;

public class Test extends JComponent {
    public static void main(String[] args) {
        if (args.length > 0 && args[0].equals("-swing")) {
            System.out.println("SWING");
            JFrame frame = new JFrame("TEST");
            frame.getContentPane().setLayout(new FlowLayout());
            frame.getContentPane().add(new JButton("JButton 1"));
            frame.getContentPane().add(new JButton("JButton 2"));
            frame.pack();
            frame.show();
        }
        else {
            System.out.println("AWT");
            Frame frame = new Frame("TEST");
            frame.setLayout(new FlowLayout());
            frame.add(new Button("Button 1"));
            frame.add(new Button("Button 2"));
            frame.pack();
            frame.show();
        }
    }
}

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