Scroll Bar



There are two windows, they all have scroll bar.
In first window, when user drag the thumb, the window will receive
WM_VSCROLL message only when the ScrollInfo.nPos is changed 5;
But in second window, the window receive WM_VSCROLL message when the
ScrollInfo.nPos is changed 15, the window size and page size is same.

I can't find what cause this result. And I want to change the action in
first window, make it is same with the second.

Any one can help me?
Thanks a lot.


.



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