CTGroupShapeNonVisual nv = shape.addNewNvGrpSpPr();
CTNonVisualDrawingProps nvpr = nv.addNewCNvPr();
nvpr.setId(0);
nvpr.setName("Group 0");
nv.addNewCNvGrpSpPr();
CTGroupShapeProperties sp = shape.addNewGrpSpPr();
CTGroupTransform2D t2d = sp.addNewXfrm();
CTPositiveSize2D p1 = t2d.addNewExt();
p1.setCx(0);
p1.setCy(0);
CTPoint2D p2 = t2d.addNewOff();
p2.setX(0);