inherit from Winforms Panel and scrolling

I have inherited from Panel fir a custom control. I draw the
document
which is a bunch of hand drawn items. I set the
AutoScrollMinSize
property to control the scroll that the user sees. When the
user clicks
on an item that is only partly in view I scroll so the item
aligns with
the top or bottom of the view port.

here's a code snippet for items with the top above the view
port

//Point itemLocation

if (itemLocation.Top < 0)
{
    int val = VerticalScroll.Value + itemLocation.Top;
   // HACK: Alert calling "VerticalScroll.Value"
once doesn NOT work
   // calling it twice does
   VerticalScroll.Value = val;
   VerticalScroll.Value = val;
   AdjustFormScrollbars(true);

   Invalidate();
}

I can't imagine that calling VerticalScroll.Value is
correct.

Any ideas?

adam