#150 Scrollbar does not position correctly on EnsureVisible

[suneel suresh]

The scrollbar on the property grid manager does not scroll correct to the correct property position when using the call
EnsureVisible(property). The property is not visible.
The GetScrollPos returns zero and SetScrollPos also does not seem to work. But SaveEditableState gives a different scroll state. Totally frustrating.
It only seems to work when the property is on the top, as the property is below the scroll bar position is not placed properly.

I am using wxpropgrid-1.4.15-win on wxWidgets 2.8.11 msw, xp64 all updates.