Replacing the menuBar associated with a Frame causes the Frame's position
to change - this problem doesn't occur under Win32 in 1.1FCS or 1.1.1Beta.
 
To reproduce, run the testcase below, and click repeatedly on the button...
 
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
 
public class Movement extends Applet
    implements ActionListener
{
    Button mButton;
    TextField mTextFld;
    Frame mFrame;
    MenuItem mMItem;
    Menu mSubMenu;
    MenuBar mTopMenu;
 
    public Movement(Frame frame)
    {
        mFrame = frame;
    }
 
    public static void main(String argv[])
    {
        Frame frame = new Frame("Menu movement problems...");
        Applet tmp = new Movement(frame);
        frame.add(tmp, "Center");
        frame.setSize(300, 300);
        frame.show();
        tmp.start();
    }
 
 
    public void start()
    {
        mButton = new Button("New Menu");
        mButton.addActionListener(this);
        add(mButton);
 
        mTextFld = new TextField("Visible");
        add(mTextFld);
 
        mMItem = new MenuItem("Plain Item");
        mMItem.addActionListener(this);
 
        mSubMenu = new Menu("SubMenu");
        mSubMenu.add(mMItem);
 
        mTopMenu = new MenuBar();
        mTopMenu.add(mSubMenu);
 
        mFrame.setMenuBar(mTopMenu);
    }
 
    public void actionPerformed(ActionEvent event)
    {
        if ( event.getSource() == mMItem )
        {
            System.out.println("Plain Item handled.");
            Toolkit.getDefaultToolkit().beep();
        }
        else if ( event.getSource() == mButton )
        {
            mFrame.setMenuBar(null);
            mFrame.setMenuBar(mTopMenu);
        }
    }
}