/**
	 * Get the editor needed to edit diagram
	 * @return the diagram editor
	 */
	protected DiagramEditor getDiagramEditor(){
		if(diagramEditor == null){
			diagramEditor = syncExec(new Result<DiagramEditor>(){
				public DiagramEditor run(){
					Diagram d = getDiagram();
					assertNotNull("diagram could not be created",d);
					
					DiagramEditor de = (DiagramEditor)GraphitiUiInternal.getWorkbenchService().
							openDiagramEditor(d);
					return de;
				}
			});
			/*
			 * Complete here .
			 */
		}
		return diagramEditor;
	}

/**
	 * Get the diagram if it exists,
	 * otherwise create diagram and diagram file
	 * @return the diagram
	 */
	protected Diagram getDiagram(){
		if(diagram == null){
			String diagramName = getDiagramFileName();
			URI diagramURI = getDiagramFileURI();
			diagram = getPeService().createDiagram(TestConstant.DIAGRAM_TYPE, diagramName, true);
			
			// yield to an exception ..
			//FileService.createEmfFileForDiagram(diagramURI, diagram);
			
			final TransactionalEditingDomain editingDomain = GraphitiUiInternal.getEmfService()
					.createResourceSetAndEditingDomain();
			final ResourceSet resourceSet = editingDomain.getResourceSet();
			final Resource diagramResource = resourceSet.createResource(diagramURI);
			URI uri = diagramResource.getURI();
			//diagramResource.getContents().add(diagram);
			editingDomain.getCommandStack().execute(new RecordingCommand(editingDomain){
				@Override
				protected void doExecute(){
					diagramResource.setTrackingModification(true);
					diagramResource.getContents().add(diagram);
				}
			});
			try{
				diagramResource.save(null);
			}catch(Exception e){}
			
			diagramEditorPageObject.setEditingDomain(editingDomain);
		}
		return diagram;
	}

FileService.createEmfFileForDiagram(diagramURI, diagram);