Mouse Wheel Events

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I've recently been updating a program from onXXX to setHandler(). The program
used to catch
Mouse Wheel Events through the shift parameter of onMouse. Now with setHandler,
the Mouse Wheel
triggers a WM_MOUSEWHEEL message, but how do I determine whether it was up or
down? With
onMouse, the shift parameter would be #780000 for up and -#780000 for down. Now
what happens?

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