I am not sure what you want to achieve. Do you want to display a shape at the center of the diagram? Or you want to bring the center of the diagram into the view.
To position a shape
manually you can use its Position property. To get the currently visible center of the diagram you can use Viewport property and based on it position the shape. For example:
Rect viewport = diagram.Viewport;
centerX = viewport.X + (viewport.Width / 2);
centerY = viewport.Y + (viewport.Height / 2);
To bring the diagram center (0,0) to the view you can use the bring into view feature
Telerik by Progress
Do you need help with upgrading your AJAX, WPF or WinForms project? Check the Telerik API Analyzer
and share your thoughts.