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).

Qt Code: 
  1. QGLFormat format;
  2.   	QGLContext* context = new QGLContext(format);
  3.         //GlWorld inherits from QGLWidget...
  4.   	GlWorld world1(context);
  5.   	MySprite single_sprite;
  6.  
  7.   	world1.InstallSprite2D(&single_sprite);
  8.   	world1.show();
  9.   	world1.run();
  10.  
  11.  
  12.    	// Application Crashes at the 
  13.         // creation of world2... not sure why?
  14. 	//              QGLcontext,  QWidget*,       QGLWidget*
  15.   	GlWorld world2(context,     	NULL,       	&world1);
  16.   	world2.InstallSprite2D(&single_sprite);
  17.   	world2.show();
  18.   	world2.run();
  19.  
  20. Part of class definition...
  21. GlWorld::GlWorld(QGLContext* context, 
  22. QWidget *parent, QGLWidget* shared) : QGLWidget(context, parent, shared)
  23. {
  24.    ...
  25.    ..
  26. }
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Any help would be great... but a working example would probably be most helpful.
thanks in advance...