Scrollbar not show in container

I have a goXam OrgChart inside a Telerik Container, specifically, RadPane. When I started to add more Org Node to the diagram, it grows and supposedly, the scrollbar of the diagram should show when the diagram size exceeds its container’s peripheral. Somehow the scrollbar does not automatically show. What should I do to to make it work?

OK. I need to correct myself here. The horizontal scroll bar shows automatically, but the vertical one does not.

My guess: have you set the Diagram.HorizontalAlignment and VerticalAlignment to Stretch?

OK. There is an extra outside the diagram. Once I removed that, it worked fine.