Arthur,

I had similar problems some time ago. I still have stack with and arrow click of -1.

I can't remember the details, but it had something to do with the counter-intuitive nature of the vertical scrollbar, that is, the thumbposition decreases as the thumb moves up. I vaguely recall discussing this with Kevin. His suggestion was to deal with the problem in the scrollbar script.

I found that reversing the start and end values for the thumposition (e.g. 100 and 0 respectively) and using the following script::

on scrollbardrag theThumbPos
  set the lineinc of me  to -1
  set the pageinc of me to -10
  put theThumbpos into field 1
end scrollbardrag

gave me the behavior I wanted.

If you look at the inspector, you will find these values of -1 and -10 in the respective fields. You can set these values in the script but not in the inspector. Perhaps your negative values were the result of a conversion from HC or SC?

But this is the hard way. It easier, and probably less dangerous, to use the script to achieve the same effect. That is

on scrollbardrag theThumbPos
  put the endvalue of me - theThumbPos into field 1
end scrollbardrag

using 1 and 10 for the line and page increments with 0 and 100 and the start and endvalues.

Jim
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