}
public String restoreVersion() {
FolderDao folderDao = FolderDao.createInstance();
CustomTreeNode ctn = (CustomTreeNode) this.versionsTreeModel.getNode();
folderDao.restoreVersion((Folder) ctn.getContent());
//TODO faire une méthode refreshState()
Folder folder = folderDao.retrieve(this.selectedFolder.getId());
this.selectedFolder = new ViewFolder(folder);
this.metadataTreeModel = getMetadataTreeNode();