Problem with NewtCanvasSWT and SWT during the GL3HelloWorld

> I'm new to JOGL, and, for some reason, I have to begin with SWT. Here is a piece:
>
>         public Trangles(GLCapabilities capabilities)
>         {
>                 Display display = new Display();
>                 Shell shell = new Shell(display);
>                 shell.setLayout(new FillLayout());
>                 Composite composite = new Composite(shell, SWT.BORDER);
>                 GLWindow window = GLWindow.create(capabilities);
>                 NewtCanvasSWT canvas = new NewtCanvasSWT(composite,
> SWT.NO_BACKGROUND,
>                                 window);
>                 window.addGLEventListener(new Event());
>
>                 shell.setSize(300, 200);
>                 shell.open();
>                 canvas.setVisible(true);
>
>                 //Here I meet the problem.
>                 //window.setVisible(true);
>
>                 while (!display.isDisposed())
>                 {
>                         if (!display.readAndDispatch())
>                                 display.sleep();
>                 }
>                 display.dispose();
>         }
>
> When I add the line "window.setVisible(true);",  the whole shader works well,
> and I get a red triangle in a new dialog window  with the shell still blank. I
> fail to mix there two window no matter I arrange the NewtCanvasSWT. is there
> any method dealing with it?
>
> Trangles.java <http://forum.jogamp.org/file/n4028988/Trangles.java>