DefaultEditDomain domain = getEditDomain();

        // Make sure the editor is valid
        Assert.isNotNull(domain);

IWorkbenchPage page = PlatformUI.getWorkbench()
                    .getActiveWorkbenchWindow().getActivePage();

      IEditorInput input = getEditorInput();
     
      // Create the pictogram for selected object

      final Diagram diagram = Graphiti.getPeCreateService()
                    .createDiagram(DIAGRAM_TYPE, object.getName(),
                            false);
       DiagramEditor editor = new DiagramEditor();
       
       final DiagramTypeProvider dtyProvider = (DiagramTypeProvider) ExtensionManager
                    .getSingleton().createDiagramTypeProvider(
                            DIAGRAM_TYPE_PROVIDER_ID);

       dtyProvider.init(diagram, editor);
         
       page.openEditor(input, DiagramEditor.DIAGRAM_EDITOR_ID);

public static IEditorInput getEditorInput() throws Exception {

        DiagramEditorInput result = null;

        final IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();

        final IProject project = root.getProject("Graphiti");

          IFile diagramFile = project.getFile("Test" + "." + "diagram");

        URI emfURI = URI.createURI(diagramFile.getFullPath().toString());
     
            if (emfURI != null) {

            URI diagramUri = emfURI.appendFragment("/0");

            result = new   DiagramEditorInput(diagramUri,
                         DiagramTypeProvider.DIAGRAMTYPE_PROVIDER_ID);
       
        }

        return result;
    }