change page content based on a comboBox selection

General
1

I have a question about vaadin 8. I have a view with a central dynamic part(_filteredContentVL) that depends on a comboBox (_serviceSelectionCmb )selection. With a ValueChangeListener I tried to rebuild the central part (_filteredContentVL=buildFilteredContent():wink: but I don’t know how to refresh the page or to change and refresh the content of the _filteredContentVL component. Any ideas?

		_root = new VerticalLayout();
		_filteredContentVL = new VerticalLayout(buildFilteredContent());
		_root.addComponent(buildSelection());
		_root.addComponent(_filteredContentVL);
		
		...
		private Component buildServiceSelection() {
			_serviceSelectionCmb.setItems(Arrays.asList(ProjectsSelectionType.x,
				ProjectsSelectionType.y, ProjectsSelectionType.z));
			_serviceSelectionCmb.setEmptySelectionAllowed(false);
			_serviceSelectionCmb.setValue(ProjectsSelectionType.x);
			_serviceSelectionCmb.addValueChangeListener(event -> {
					_filteredContentVL=buildFilteredContent();
				}
			});
		}
		...

		...
		private VerticalLayout buildFilteredContent() {
			VerticalLayout contentVL = new VerticalLayout();
			switch (_serviceSelectionCmb.getValue()) {
			case ProjectsSelectionType.x:
				contentVL.addComponent(new CSProjectsView());
				break;
			case ProjectsSelectionType.y:
				contentVL.addComponent(new IMProjectsView());
				break;
			case ProjectsSelectionType.z:
				contentVL.addComponent(new BPProjectsView());
				break;
			default:
				contentVL.addComponent(new CSProjectsView());
				break;
			}
			return contentVL;
}