If you set this.radScrollablePanel1.PanelContainer.VerticalScroll.Value = 170, the content will be scrolled, but the position of the scrollbar thumb will not be changed. You should call ((RadVScrollBar)this.radScrollablePanel1.Controls[1]).Value = 170 explicitly. However, this should happen automatically.

Resolution: The .NET framework does not provide a way to get notified when the values of the PanelContainer's scrolls have changed. To set the values programmatically use:

this.radScrollablePanel1.VerticalScrollbar.Value = value;this.radScrollablePanel1.HorizontalScrollbar.Value = value;