Perhaps you could try using the lbuttonup event if using the pfc or creating a user event mapped to the pbm_lbuttonup event (but you would have to check to make sure the user is not clicking on a 'non-scrollbar' portion of the dw).
Another idea would be to check the vertical scroll position against the vertical scroll bar maximum position.
I've not done either so I can't provide any examples or pitfalls of either approach.
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