Java tutorial
import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class MainClass { public static void main(String[] a) { Display d = new Display(); 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(); } } class ChildShell { ChildShell(Shell parent) { Shell child = new Shell(parent); child.setSize(200, 200); child.open(); } }