.net - Silverlight ScrollViewer or HorizontalScrollBar -

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I have the ScrollViewer and the child stack panel. When I add content, I need my horizontal scrollbar. how to do this? Items dynamically added to the stack panel item I am trying to use this. ScrollViewer.ScrollToRight (); But this is not always a scrolling.

"myScroll" is the name of the scroll viewer. 

  myScroll.ScrollToHorizontalOffset (myScroll.ExtentWidth);

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