fig4.setBackgroundColor(ColorConstants.white);
img = new Image(Display.getCurrent(), fig1.getClientArea().width,
fig1.getClientArea().height);
imageGC = new GC(img);
Graphics g = new SWTGraphics(imageGC);
fig4.paint(g);
fig3.paint(g);
fig2.paint(g);
fig1.paint(g);
g.dispose();
exportImageJob(img, imageGC, saveLocation,