int commentEdge = 15;
Rectangle rect = gaService.createInvisibleRectangle(containerShape);
gaService.setLocationAndSize(rect, context.getX(), context.getY(), width, height);
Shape lineShape = peCreateService.createShape(containerShape, false);
Polyline line = gaService.createPolyline(lineShape, new int[] { commentEdge, 0, 0, 0, 0, height, commentEdge,
height });
line.setStyle(StyleUtil.getStyleForClass(getDiagram()));
line.setLineWidth(2);
gaService.setLocationAndSize(line, 0, 0, commentEdge, height);