@Override
	public Object execute(ExecutionEvent arg0) throws ExecutionException {
		editor = HandlerUtil.getActiveEditor(arg0);
		service = editor.getAppService();
		List<EObject> contents = editor.getResource().getContents();
		List<Element> elements = service.animateDiagram(contents.get(1), contents.get(0));
                while(counter<elements.size()){
		  counter = Service.getCounter();
		  Service.setCounter(++counter);
		  if (counter == elements.size())
			Service.setCounter(0);
		  ((ToolBehaviorProvider) editor.getDiagramTypeProvider().getFeatureProvider().getDiagramTypeProvider().getAvailableToolBehaviorProviders()[0]).animateElement(elements, counter);
		  
                  try{
                      synchronized(this){
                       this.wait(1000);
                      }
                     }
                  catch(Exception ex){
                     
                     }
                }
		return null;
	}

	TransactionalEditingDomain domain = this.getDiagramTypeProvider()
			.getDiagramEditor().getEditingDomain();
	domain.getCommandStack().execute(new RecordingCommand(domain) {

		@Override
		protected void doExecute() {
                 //code here
                }
        });

                  try{
                      synchronized(this){
                       this.wait(1000);
                      }
                     }
                  catch(Exception ex){
                     
                     }

thread_ = new Thread() {
   @Override
   public void run() {
      Loop {
          Thread.sleep(1000);
      }
   }
}.start();

 // in your xToolBehaviorProvider
 public IDecorator[] getDecorators(PictogramElement pe) {
  List<IDecorator> decorators = new ArrayList<IDecorator>();
  EObject bo = Graphiti.getLinkService().getBusinessObjectForLinkedPictogramElement(pe);
 ... (deduce color of object, from some state/properties ; not stored inside the PE or the BO, but somewhere else)
  if(shouldColorObject) {
     // set change background color (color should not be hardcoded here)
     decorators.add(new ColorDecorator(null, new ColorConstant(250, 250, 120))); 
  }
  return decorators.isEmpty() ? super.getDecorators(pe) : decorators.toArray(new IDecorator[decorators.size()]);
 }

   ... (update the "state" of your objects)
   getEDitor().getDiagramBehavior().refresh();