private void verifiesModelExplorerView() {
		IWorkbench workbench = PlatformUI.getWorkbench();
		IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
		
		IViewReference[] views = window.getActivePage().getViewReferences();
		
		IViewPart viewPart = null;
		
		for (IViewReference view : views) {
			if (view.getTitle().equals("Model Explorer")) {
				// viewPart receives a ModelExplorerPageBookView view
				viewPart = view.getView(true);
				
				// Get out from the for statement
				break;
			}
		}
		
		ModelExplorerPageBookView modelExplorerPageBookView = new ModelExplorerPageBookView();
		
		if (viewPart instanceof ModelExplorerPageBookView) {
			modelExplorerPageBookView = (ModelExplorerPageBookView) viewPart;
		}
		else {
			System.out.println("viewPart should be a instance of ModelExplorerPageBooView.");
		}
		
		//System.out.println(modelExplorerPageBookView.getTitle());
		
		// link ModelExplorerPageBookView with ModelExplorerView
		
		// and through CommonViewer
		//CommonViewer commonViewer = modelExplorerView.getCommonViewer();
		
		//modelExplorerView.getControl().setFocus();
	}

// we look for the modelexplorer
IViewPart modelexplorer;
try {
	modelexplorer = activeWorkbenchWindow.getActivePage().showView(AbstractHandlerTest.viewId);
} catch (PartInitException ex) {
	ex.printStackTrace(System.out);
	setStatus(new Status(IStatus.ERROR, bundle.getSymbolicName(), ex.getMessage()));
	return;
}
ModelExplorerPageBookView view = (ModelExplorerPageBookView)modelexplorer;
IPage currentPage = view.getCurrentPage();
ModelExplorerPage page = (ModelExplorerPage)currentPage;
IViewPart viewer = page.getViewer();
modelExplorerView = (ModelExplorerView)viewer;
modelExplorerView.setFocus();

// we look for the common viewer
commonViewer = modelExplorerView.getCommonViewer();

selectionService = activeWorkbenchWindow.getSelectionService();
ISelection selection = selectionService.getSelection();

modelExplorerView.selectReveal(selection);

// Or commonViewer
node = treeViewer.getNode(ID);

// To select the node in Model Explorer
modelExplorerView.selectReveal(node);

public String getUMLId() {
	String id=((XMLResource) this.uml_state.eResource()).getID(uml_state);
	return id;
}

out.write(pred.getPredicateName()+","+state.getUMLId()+"\n");

Object[] visibleElement = commonViewer.getVisibleExpandedElements();
modelRoot = EMFHelper.getEObject(visibleElement[0]); //There are much better ways to access a model element, but I'm not sure what you have access to, at this time
Resource umlResource = modelRoot.eResource(); //The UML Resource
EObject umlElement = umlResource.getEObject(id); //If id it the EObject's URI Fragment, this will return the correct EObject
if (umlElement instanceof State){
    State state = (State)umlElement;
    ... //Now you have the UML State element
}

ModelExplorerPageBookView view = ...;
ServicesRegistry registry = view.getAdapter(ServicesRegistry.class);
try {
    ModelSet papyrusModelSet = registry.getService(ModelSet.class);
    UmlModel umlModel = (UmlModel)papyrusModelSet.getModel(UmlModel.MODEL_ID);
    EObject modelRoot = umlModel.lookupRoot();
    ... //Now you have the modelRoot
} catch (ServiceException ex){
    //Do log
}

private void getModelExplorerView(String elementID) {

		IWorkbench workbench = PlatformUI.getWorkbench();
		IWorkbenchWindow window = workbench.getActiveWorkbenchWindow();
		
		IViewPart modelExplorerViewPart;
		
		try {
			modelExplorerViewPart = window.getActivePage().showView(modelExplorerViewId);
		} catch (PartInitException ex) {
			ex.printStackTrace(System.out);
			return;
		}
		
		ModelExplorerPageBookView view = (ModelExplorerPageBookView)modelExplorerViewPart;
		IPage currentPage = view.getCurrentPage();
		ModelExplorerPage page = (ModelExplorerPage)currentPage;
		IViewPart viewer = page.getViewer();
		ModelExplorerView modelExplorerView = (ModelExplorerView)viewer;
		
		CommonViewer commonViewer = modelExplorerView.getCommonViewer();
		
		findElementInModelExplorer(commonViewer, view, elementID);

                // What I have tried...
		/*
		EObject element = findElementInModelExplorer(commonViewer, view, elementID);
		
		commonViewer.getControl().setFocus();
		commonViewer.setSelection(new StructuredSelection(element), true);
		commonViewer.reveal(element);
		commonViewer.getSelection();
		commonViewer.expandToLevel(element, 1);
		*/
	}

	private void findElementInModelExplorer(TreeViewer treeViewer, ModelExplorerPageBookView view, String elementID) {
	
		ServicesRegistry registry = (ServicesRegistry) view.getAdapter(ServicesRegistry.class);
		
		try {
			ModelSet papyrusModelSet = registry.getService(ModelSet.class);
			UmlModel umlModel = (UmlModel)papyrusModelSet.getModel(UmlModel.MODEL_ID);
			EObject modelRoot = umlModel.lookupRoot();
			
			//The UML Resource
			Resource umlResource = modelRoot.eResource(); 
			
			//If ID is the EObject's URI Fragment, this will return the correct EObject
			EObject umlElement = umlResource.getEObject(elementID.trim());
			
			if (umlElement instanceof State){
				//Now I have the UML State element
				State state = (State)umlElement;
			    
				// Just to see if is right
			        System.out.println(state.getName());
			}
			
		} catch (ServiceException | NotFoundException e) {
			e.printStackTrace();
		}
	}

modelExplorerView.revealSemanticElement(List);