What is the simplest way to show “loading indicator” during an RPC call in GWTP?

I am using GWTP to build my webapp. Here is my problem. I have a customer page (CustPresenter). When that page is visited, it will call & load Data from Database.

It may take a while to load all data, so I want my current Browser locked so that the user can not click any things while data has not finished downloading yet.

So here is what I am thinking. I want to show a DialogBox right before I make the RPC call & hide it when the call finishes. Look at the below code:

public class CustPresenter extends      Presenter<CustPresenter.MyView, CustPresenter.MyProxy> {        private DialogBox loadingDialogBox=new DialogBox();        @Inject DispatchAsync dispatchAsync;        @Override      public void prepareFromRequest(PlaceRequest request){           super.prepareFromRequest(request);           loadingDialogBox.show();           GetData getDataAction=new GetData();           dispatchAsync.execute(getDataAction, getDataCallback);        }        private AsyncCallback<GetDataResult> getDataCallback=new AsyncCallback<GetDataResult>(){            @Override          public void onFailure(Throwable caught) {              loadingDialogBox.hide();          }            @Override          public void onSuccess(GetVerbFromTripleResult result) {               //show data here (it may take long time)               loadingDialogBox.hide();          }     };  }  

However, when runing, the dialogbox only shows up for 1 second & then disappears. Right After that all the UiBinder Guis show up on the Customer Page & user can click any buttons on the page while the data has not finished downloading yet. This is not a correct behavior.

I want to do something like this http://sqlfiddle.com/#!2/a2581/1. As u can see, when u first time open that link, a loading panel popups & u can't click anything until all guis show up.

So, why do I have this problem?

How to fix it?

Or generally, What is the simplest way to show "loading indicator" during an RPC call in GWTP?

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