CreateViewRequestFactory.getCreateShapeRequest()

ElementNameEditPart elementNameEditPart = (ElementNameEditPart) createdEditPart;

elementNameEditPart.setLabelText("new one");

EditPart createdEditPart = ... ; // previously created EditPart

ElementImpl el = (ElementImpl)createdEditPart.resolveSemanticElement();

editor.getDiagramEditDomain().getDiagramCommandStack().execute(
						new Command() {
							@Override
							public void execute() {
								super.execute();
                                                                el.setName("new name...");
							}
						}
				);