Best way to draw (not plot) on a graph?

Hi -
I need to alter the appearance of a graph somewhat. The user doesn't want any full grid lines, but he does want a small crosshair (like a plus sign) drawn in each of the four quadrants. The CanvasDrawLine() function would be good for this, if it worked on graph objects, but it doesn't. I guess I could use bit files, but...is there an easier/better way?
EDIT: after reading a little more on bit maps, it's not clear to me that these will work, either. So...any other ideas at all?
Thanks.
Solved!
Go to Solution.

Going on the line of wolfgang suggestion, you could also have two graphs one on top of the other. The lower one can have all fixed elements (scales, axes, crosses and so on), while on the upper one, with transparent background, you can draw / erase your data plots. As long as you keep axes for both graphs with the same scale the system works like a charm, and you don't need to struggle with pixel conversion between the graph and the picture.
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