[RESOLVED] VBAccelerator Scrollbar Class Issue

[Jonney]

I am trying to use VBAccelerator Scrollbar class to scroll picture in picturebox. But I have a Max Thumb position Issue ,which either is related to my code or this scrollbar class.

For example:
My picturebox's ScaleWidth is 600 pixels,the picture has 1000 pixels width.

        m_HVScroll.Visible(efsHorizontal) = True
        m_HVScroll.Min(efsHorizontal) = 0
        m_HVScroll.LargeChange(efsHorizontal) = 600 'equal to picture1.ScaleWidth
        m_HVScroll.Max(efsHorizontal) = 1000-600     'Maximum available movement
        m_HVScroll.SmallChange(efsHorizontal) = 10   'click button to move 10 pixels

If I fast move the Thumb, the debug window show the m_HVScroll.Value(efsHorizontal) = 401.
If I click the Right button, the Value change to 400, I can see the scrollbat stepping backward 1 pixel.

Those are not what I want. I need m_HVScroll.Value(efsHorizontal)= 400 at the end.

In Class, I saw tSI.nTrackPos = 401 (Note: or HiWord of wParam). How to prevent max limit in the subclass of WM_HSCROLL?

I attach the class.