Using the scroll wheel as a hotkey

[olipcs]

ok, out of curriosity, i tested a the following simple script with my browser, my explorer, my editor.

<Hotkey WheelForward>
 	<SendFocusWin>
   		<Key WheelForward>


 <Hotkey WheelBackward>
  	<SendFocusWin>
    		<Key WheelBackward>

allways no scrolling did happen (but this may also be, because all of this programms use child windows (i think), argh...).