Wheel Move not being detected

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I am trying to use the mouse wheel to zoom in and out of a graphic.

However, it does not detect it in the graphics window. I know that my wheel
move works, since I have an up down control, and when I give that focus, the
mouse wheel scrolls that up and down automatically.

Andy Katz
B.S. Computer Science, 1978
Rensselaer Polytechnic Institute (RPI)

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