<go:Diagram x:Name="myDiagram" Grid.Row="0" CenteredNodeData="{Binding ElementName=myDiagram, Path=SelectedNode.Data}" />
This calls DiagramPanel.CenterPart when the value of this property changes or when a layout completes in DiagramPanel.OnLayoutCompleted.
This property, if non-null, takes precedence over the InitialCenteredNodeData property.