Hi Sergey,

>It could be a bug. I don't see why it shouldn't scroll when Shift key is pressed.

Probable answer.

When focus is on a grid, VFP catch the event for implement the standard behaviour,
a bad C++ internal routine execute a code like this:

* track Event logging intercept this point
*if specialbutton is none
   { prepare for scroll
   * nodefaultVar = 1
   * execute MouseWhell VFP code
   * if nodefaultVar=1
        {do scroll }
   }

Spinner haven't this error because it do the operation for all NONE/SHIFT/CTRL/ALT mousewheel.

I think VFPT want implement grid mousewhell behaviore only for none key, but have lost
the else code.

Fabio