public class TestMeOut
{
    public static void main(final String[] args)
    {

        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(1, false));

        final Shell shell2 = new Shell(shell);
        shell2.setLayout(new GridLayout());

        final Button btn = new Button(shell, SWT.PUSH);
        final Button btn2 = new Button(shell2, SWT.PUSH);

        btn.setText("Test me");
        btn2.setText("I steal focus");

        btn.addSelectionListener(new SelectionAdapter()
        {
            @Override
            public void widgetSelected(final SelectionEvent e)
            {
                shell2.setVisible(true);
            }
        });

        btn2.addSelectionListener(new SelectionAdapter()
        {
            @Override
            public void widgetSelected(final SelectionEvent e)
            {
                shell2.setVisible(false);
            }
        });

        shell.pack();
        shell.open();

        shell.addShellListener(new ShellListener()
        {

            public void shellIconified(final ShellEvent e)
            {
            }

            public void shellDeiconified(final ShellEvent e)
            {
            }

            public void shellDeactivated(final ShellEvent e)
            {
                System.out.println("Deactivated! This isn't supposed to happen.");
            }

            public void shellClosed(final ShellEvent e)
            {
            }

            public void shellActivated(final ShellEvent e)
            {
                System.out.println("Activated!");
            }
        });

        shell2.pack();
        shell2.open();
        shell2.setVisible(false);

        while (!shell.isDisposed())
        {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}