All Node Display in Screen

GoSilverlight 1.2.24

I have a two question.
1. How to control fit on screen. All Node display in screen ( not scroll)
2. How to set scrollviewer vertical offset postion.
For prevent scrollviewer vertical postion moved after node data

A number of Diagram properties are of interest to you: Stretch, HorizontalContentAlignment, VerticalContentAlignment, and several properties that start with “Initial”.

You might want to set Diagram.Stretch=“Uniform”, but I’m not sure what you really want.

The User Guide discusses these properties and their effects.

I solved scrollviewer vertical postion setting.
Using LayoutCompleted event .
code add diagram.Panel.SetVerticalOffset(0.0);