NSView -scrollPoint doesn't work with mouse wheel?

FROM : Allen Dang
DATE : Mon Dec 31 16:28:36 2007

Hi,

I scrolled one NSScrollView programmatically like following:

NSPoint newPosition = NSMakePoint(0.0, 100.0);
[[scrollView documentView] scrollPoint:newPosition];

Ok, the scrollView did scroll to the new position, then I tried to 
continuously scroll down by using the mouse wheel, but the 
NSScrollView didn't work as I expected.
It will return to the the point(0.0, 0.0) at first and start to scroll 
down rather then keep scrolling from point(0.0, 100.0).

What's happening? It drives me crazy....

Allen Dang
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