Plz help me on this..

Recently i am working on a gwt ext project and i used Navigation tree to list menu items in my home page.. but recently my client ask from me to disable some of the menu items until he process some task..i  am really struggle with that and i did not able to find solution..if anyone know a solution please suggest me.. i attached image of my tree and the way i put items to tree 

private void getApplicationsForUser() {

System.out.print("Method CALLING...");

LoadingMask.show("Permissions & Menu ...");

ProfileService.Util.getInstance().getUserPermissions(new AsyncCallback<List<Application>>() {

public void onSuccess(List<Application> result) {

LoadingMask.hide();

/* Application application = result.get(0);

BaseTreeModel item = new BaseTreeModel();

item.set(NavigationTree.ID, application.getId());

item.set(NavigationTree.NAME, application.getDescription());

navigationTree.getStore().add(item, true);*/

// for (int i = 0; i < 10; i++) {

for (int j = 0; j < result.size(); j++) {

Application application = result.get(j);

BaseTreeModel item = new BaseTreeModel();

item.set(NavigationTree.ID, application.getMid().toString());

item.set(NavigationTree.NAME, application.getMdesc());

// navigationTree.getStore().add(item, false);

if ("PR".equals(application.getMpcode())) {

navigationTree.getStore().add(item, false);

result.remove(j--);

} else {

BaseTreeModel findModel = navigationTree.getStore().findModel(NavigationTree.ID, application.getMpcode());

if (findModel != null) {

navigationTree.getStore().add(findModel, item, false);

result.remove(j--);

navigationTree.setExpanded(findModel, true);

}

}

}

// }

}

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