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

[Tom]

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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