windows phone 8 - ScrollViewer doesn't scroll to VerticalOffset -

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I have found a ScrollViewer that has a StackPanel (which contains ExpanderViews)

The ScrollViewer workspace offset when ExpanderViews are expanded. Although the ScrollViewer does not scroll up at all.

There is a vertical ScrollViewer scroll from the FScrollViewer_LayoutUpdated () method only to compensate for the time.

Is there any way to update VerticalOffset (or ScrollToVerticalOffset) in another way?

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