FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b104)
Java HotSpot(TM) 64-Bit Server VM (build 19.0-b05, mixed mode)

also reproducible on 6u21

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 7 Ultimate

A DESCRIPTION OF THE PROBLEM:

Running next code snippet you will see that Choice is not fully drawn.
Screenshot is attached.

import java.awt.BorderLayout;
import java.awt.Choice;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
public class Mixing_ChoiceGlassPane {
    protected final static String[] petStrings = {"Bird", "Cat", "Dog", "Rabbit", "Pig"};

    public static void main(String[] args) {
        JFrame frame = new JFrame("Glass Pane children test");
        frame.setLayout(null);

        Container contentPane = frame.getContentPane();
        contentPane.setLayout(new BorderLayout());

        Choice c = new Choice();
        for (int i = 0; i < petStrings.length; i++) {
            c.add(petStrings[i]);
        }
        contentPane.add(c);

        Container glassPane = (Container) frame.getRootPane().getGlassPane();
        glassPane.setVisible(true);
        glassPane.setLayout(null);

        JInternalFrame internalFrame = new JInternalFrame("Internal Frame", true);
        internalFrame.setBounds(50, 0, 200, 100);
        internalFrame.setVisible(true);
        glassPane.add(internalFrame);

        frame.setSize(400, 400);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}
Failed test:
AWT_Mixing/Automated/GlassPaneOverlapping/JGlassPaneInternalFrameOverlapping.java jtreg