@PostConstruct
void postContruct(@ContextValue(value="theSelectedFile") ContextBoundValue<File> selectedFileCBV) {
	// create UI

	// Initialize with currently selected File
	File selectedFile = selectedFileCBV.getValue();
	setSelectedFile(selectedFile);
	
	// Don't forget to dispose the Subscription on @PreDestroy
	Subscription subscription = selectedFileCBV.subscribeOnValueChange(file -> setSelectedFile(file));
}