UIHANDLER OnMouseWheel

Description
Called when mousewheel is spun while the mouse pointer is over the frame. If a frame does not have an OnMouseWheel handler, the event is passed on to underlying frames.

Arguments

 * delta : Number indicating the direction the wheel is spinning
 * 1 for spinning up
 * -1 for spinning down
 * (i.e. you will want to use (-delta) for offsetting the position in a list view)

Note
If a frame did not previously have an &lt;OnMouseWheel&gt; tag, which will always be the case for CreateFrameed frames, you need to do Frame:EnableMouseWheel(1) on it in order to receive this event.