In the meantime, I would suggest that there is something available online that can be linked to, via a new tab or window. Something like: SketchPad and K-Sketch if you want something animated. These tools are free, I understand and used online. Well, I have used Sketchpad, but not K-Sketch, and just a quick demo with it it might be useful for what you want..maybe. A bit simple for complex graphs though I would think.