When an object is disabled
the event MouseWheel is called on the object
and on the whole hierarchy up to the form,
a NODEF command stop the call sequence.

A non binded grid is implicitly disabled.
it is a design choice, debatable but subjective.

The bug:
On a not binded grid,
the mousewheel is called,
but the whole hierarchy up to the form
is not called.

Repro.
Expected :
- Form.Mousewheel call
and the Grid become RED.

Run and rotates the mouse wheel.

PUBLIC oform1

oform1=NEWOBJECT("form1")
oform1.Show

DEFINE CLASS form1 AS form
* a side effect is on form's wheel scrolling
*	scrollBars = 3
	
	ADD OBJECT grid1 AS grid WITH ;
		Anchor = 15,;
		Height = 500, ;
		RecordSource = " ", ;
		Width = 500, ;
		Name = "Grid1"

	PROCEDURE MouseWheel
		LPARAMETERS nDirection, nShift, nXCoord, nYCoord
		this.grid1.backColor = 255
	ENDPROC

ENDDEFINE