[flexcoders] Re: Flex 3.0 ADG : vertical scroll bar does not scroll up when dragging

[tungchau81]

I found out that AdvancedListBase.dragScrollingInterval is always 0 
when dragEnabled=true. Therefore AdvancedListBase.dragScroll() function 
always returns early since it has the following condition:

  // sometimes, we'll get called even if interval has been cleared
        if (dragScrollingInterval == 0)
            return;