How to add an Initial state to a state diagram

Plug-in & Open API
1

What is the proper method to add an initial state to a state diagram? I currently do the following:

IModelElement state = IModelElementFactory.instance().createInitialState();
IDiagramElement shape = DiagramManager.instance().createDiagramElement ( diagram, state );

But there is not an InitialState element added to the model and it does not show up in the diagram.

Thanks for any help.

Jay Kallaher