import org.eclipse.swt.widgets.*;

public class ChildShellExample {
    Display d = new Display();
    
    
    ChildShellExample()    {    
        Shell s = new Shell(d);
        s.setSize(500,500);
        s.open();
        ChildShell cs = new ChildShell(s);
        while(!s.isDisposed()){
            if(!d.readAndDispatch())
                d.sleep();
        }
        d.dispose();
    }
}