Single QGLContext across multiple QGLWidgets

I'm having some serious issues trying to figure out how I successfully share a single QGLContext across multiple QGLWidgets. I want to share resources (display lists, vertex buffer objects, textures, etc) across both to optimize data loading (i.e. only create a single large VBO to draw in multiple gl windows).

Code:

---

QGLFormat format;
  	QGLContext* context = new QGLContext(format);
        //GlWorld inherits from QGLWidget...
  	GlWorld world1(context);
  	MySprite single_sprite;
 
  	world1.InstallSprite2D(&single_sprite);
  	world1.show();
  	world1.run();
 
 
   	// Application Crashes at the 
        // creation of world2... not sure why?
	//              QGLcontext,  QWidget*,       QGLWidget*
  	GlWorld world2(context,     	NULL,       	&world1);
  	world2.InstallSprite2D(&single_sprite);
  	world2.show();
  	world2.run();
 
Part of class definition...
GlWorld::GlWorld(QGLContext* context, 
QWidget *parent, QGLWidget* shared) : QGLWidget(context, parent, shared)
{
   ...
   ..
}

---

Any help would be great... but a working example would probably be most helpful.
thanks in advance...

No one have any ideas on this?

What does GlWorld::run() do?