int whalf = width / 2;
int[] xy = { 0, 10, whalf, 20, width, 10, width, height - 10, whalf, height, 0, height - 10 };
int[] bend = { 0, 0, whalf, whalf, 0, 0, 0, 0, whalf, whalf, 0, 0 };
Polygon polygon = gaService.createPolygon(invisibleRect, xy, bend);
polygon.setFilled(true);
// polygon.setForeground(manageColor(StyleUtil.CLASS_FOREGROUND));
StyleUtil.applyBGStyle(polygon, this);
xy = new int[] { 0, 14, whalf, 24, width, 14 };