AccessibleJComboBox.getAccessibleSelection(int) method incorrectly returns
null, in JDK1.4.0beta-b40. It works correctly in previous builds.

See example

---------- Tests.java ----------------
import javax.swing.*;
import javax.accessibility.*;

public class Test {
                    
    public static void main(String argv[]) {
        JComboBox o = new JComboBox();
        o.addItem("Test");

        AccessibleSelection c =
                o.getAccessibleContext().getAccessibleSelection();
    
        o.setSelectedIndex(0);
        System.out.println("getAccessibleSelection(0) returns "
+ c.getAccessibleSelection(0));
             
    }
                    
}

------------- JDK1.4.0beta-b89 output-------------------------
getAccessibleSelection(0) returns null

------------- JDK1.4.0beta-b35 output-------------------------
getAccessibleSelection(0) returns javax.swing.JList$AccessibleJList$AccessibleJListChild@462851
--------------------------------------------------------------

We have filed similar bug #4401715 wich is now in fixed state,
but the problem still exists. Also this bug is a regression,
hence it should be fixed and integrated in merlin.

The corresponding JCK test now is excluded, and appropriate entry
is appeared in red bugs exclude list, wich should empty till the
JCK code freeze. So we need this bug to be fixed.

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