CompositeNode vg2 = new CompositeNode("vg2");
vg2.addChild(cylinder);
vg2.addChild(cylinder2);
vg2.addChild(cylinder3);
vg2.addChild(cylinder4);
vg2.addChild(cylinder5);
vg2.addChild(sphere);
AspectSubTreeNode simulation = new AspectSubTreeNode(
AspectTreeType.WATCH_TREE);
simulation.setModified(true);